Laboratory Manual for Introductory Geology 4e

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13.8 When There’s Too Much Water: FloodsA flood occurs when more water enters a stream than its channel can hold. Manyfloods are seasonal, caused by heavy spring rains or the melting of thick wintersnow cover. Others, called flash floods, follow storms, which can deliver a footor more of rain in a few hours. FIGURE 13.22 is a map compiled by the FederalEmergency Management Agency (FEMA) showing the estimated flood potentialin each of the United States, based on the number of square miles that would beinundated.It might appear that states lightly shaded in Figure 13.22 would experiencelittle flood damage, but that would be an incorrect reading of the map. Twoof the worst river floods in U.S. history occurred in Rapid City, South Dakota,and in Johnstown, Pennsylvania. Indeed, these two cities have been floodedmany times. The area of potential flooding may not be as large in South Dakotaand Pennsylvania as in some other states, but the conditions for flooding occurfrequently. South Dakota’s Rapid Creek has flooded more than 30 times sincethe late 1800s, including a disastrous flash flood on June 9, 1972, triggered by15 inches of rain in 6 hours. The creek overflowed or destroyed several dams,ruined more than 1,300 homes and 5,000 cars, and killed more than 200 peoplein Rapid City (FIG. 13.23).FIGURE 13.22 Flood potential in the United States.Square miles of landprone to floodingLess than 1,000 sq. miles1,000 to 2,999 sq. miles3,000 to 5,999 sq. miles6,000 to 10,999 sq. milesMore than 11,000 sq. miles13.8 WHEN THERE’S TOO MUCH WATER: FLOODS355
FIGURE 13.23 Effects of the June 9, 1972, flood in Rapid City, South Dakota.(a) Rapid Creek has a narrow floodplain where it flows throughDark Canyon, 1 mile upstream of Rapid City. Floodwater filled theentire floodplain. Concrete slabs (arrows) are all that is left of thehomes built in the floodplain.(b) The spillway of the Canyon Creek Dam (arrow) becameclogged with debris carried by the floodwater, causing water toflow over the dam, which then failed completely.(c) Not the usual lineupof cars for gasoline.(d) This railroad trestle, along with highway bridges,was washed away, slowing relief efforts.356 CHAPTER 13 LANDSCAPES FORMED BY STREAMS
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LABORATORY MANUALFOR INTRODUCTORY G
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CONTENTSPreface viiCHAPTER 1Setting
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CHAPTER 8Studying the Earth’s Lan
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PREFACEThis laboratory manual is ba
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exercises interspersed throughout t
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Supplements(available for download
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ABOUT THE AUTHORSAllan Ludman is Pr
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LEARNINGOBJECTIVES■ Understand ch
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One way to obtain more data would b
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TABLE 1.1 Basic definitions●●
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EXERCISE 1.2Reservoirs in the Earth
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EXERCISE 1.4Sources of Heat for Geo
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1.3 Units for Geologic MeasurementB
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FIGURE 1.5 Measuring the volume of
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FIGURE 1.6 The white cliffs of Dove
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MileFIGURE 1.7 Methods for dealing
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FIGURE 1.8 An example of the princi
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EXERCISE 1.9Name:Course:How Long Do
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APPENDIX 1.1Metric-U.S. Customary C
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LEARNINGOBJECTIVES■■Become fami
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plate between two continents, conti
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FIGURE 2.4 The Earth’s major clim
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More clues soon came from seismolog
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FIGURE 2.8 Magnetic reversals of th
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FIGURE 2.11 Rates of motion of the
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EXERCISE 2.7A Tale of Two RidgesNam
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EXERCISE 2.8Continental Rifting: Sp
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Even without any earthquake informa
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EXERCISE 2.10Estimating the Amount
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2.5.5 Hot Spots and Hot-Spot Tracks
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EXERCISE 2.11Name:Course:Determinin
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EXERCISE 2.12Name:Course:Long-Term
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GEOTOURS EXERCISE 2Analyzing Plate
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LEARNINGOBJECTIVES■ Understand wh
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When a mineral grows without interf
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FIGURE 3.1 Specimens of the mineral
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3.4.5 HardnessThe hardness of a min
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FIGURE 3.4 Crystals of some common
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FIGURE 3.6 Cleavage in common miner
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3.4.9 MagnetismA few minerals are a
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EXERCISE 3.7Identifying MineralsNam
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The minerals and elements we most r
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EXERCISE 3.9Mineral Resources in Yo
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GEOTOURS EXERCISE 3Extracting Miner
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APPENDIX 3.1Mineral Identification
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APPENDIX 3.2Determinative Tables fo
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APPENDIX 3.2Determinative Tables fo
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APPENDIX 3.3Common Minerals and The
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MINERAL PROFILE DATA SHEET NameSamp
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LEARNINGOBJECTIVES■■Understand
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FIGURE 4.1 The rock cycle.Heating a
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FIGURE 4.3 Typical grain shapes.(a)
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EXERCISE 4.2Describing a Rock’s T
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EXERCISE 4.3Understanding the Origi
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EXERCISE 4.4Interpreting the Textur
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■ Hardness: Use a steel safety pi
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FIGURE 4.6 Flowchart for determinin
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4.8 The Economic Value of RocksMost
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FIGURE 4.7 Examples of igneous, sed
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GEOTOURS EXERCISE 4Deciphering Land
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crystalline rocks. Those that are s
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EXERCISE 5.3Interpreting Igneous Co
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FIGURE 5.4 Volcanic glasscontains n
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EXERCISE 5.5Interpreting Fragmental
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Felsic igneous rocks (from feldspar
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minerals melt, and (3) how plate-te
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EXERCISE 5.8Insights from Melting a
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EXERCISE 5.9Explaining Features of
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extreme crustal stretching has expo
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EXERCISE 5.13Interpreting Plate-Tec
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FIGURE 5.12 Distribution of volcano
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FIGURE 5.14 Comparison of areas in
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EXERCISE 5.15Stratovolcano Disaster
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GEOTOURS EXERCISE 5Exploring the Na
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IGNEOUS ROCKS STUDY SHEET NameSampl
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FIGURE 6.2 Chemical weathering of f
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FIGURE 6.3 The five steps in clasti
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6.3.2 Chemical Sedimentary RocksChe
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6.3.3 Biochemical and Organic Sedim
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TABLE 6.2 Classification of common
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FIGURE 6.5 Flow chart for identifyi
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FIGURE 6.6 Sediment sorting.(a) Poo
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EXERCISE 6.7Recognizing Sediment De
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FIGURE 6.9 Sedimentary rock beds.(a
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FIGURE 6.12 Cross bedding, a type o
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FIGURE 6.15 Fossils reveal remarkab
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FIGURE 6.16 Examples of depositiona
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EXERCISE 6.10Interpreting Sedimenta
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SampleTexture(grain size, shape,sor
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FIGURE 7.1 Examples of changes from
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FIGURE 7.2 Growth of metamorphic mi
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FIGURE 7.3 Types of stress.(a) Comp
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FIGURE 7.5 Photomicrographs of rock
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FIGURE 7.6 Varieties of gneiss form
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EXERCISE 7.2Identifying Metamorphic
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FIGURE 7.11 Settings of metamorphis
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EXERCISE 7.4Interpreting the Type o
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EXERCISE 7.5Name:Course:Index Miner
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Sample Minerals presentMETAMORPHIC
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Sample Minerals presentMETAMORPHIC
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EXERCISE 8.1Which Image Works Best?
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More sophisticated grid systems are
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EXERCISE 8.2The Latitude/Longitude
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EXERCISE 8.3Locating Points with th
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EXERCISE 8.4Locating Points with th
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But which north is north? No, this
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e300FIGURE 8.10 An area in eastern
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8.4 Vertical Exaggeration:A Matter
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GEOTOURS EXERCISE 8Locating Places
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LEARNINGOBJECTIVES■ Understand ho
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this information on the most recent
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FIGURE 9.5 Digital elevation model(
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250300300FIGURE 9.7 Hachured contou
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9.3.4 Rules and Applications of Con
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EXERCISE 9.6Name:Course:Survival of
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FIGURE 9.8 Map of the microwave tow
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FIGURE 9.11 The effect of vertical
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GEOTOURS EXERCISE 9Working with Top
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APPENDIX 9.1Topographic Map Symbols
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Interpreting GeologicStructures on
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of structures on the ground (the ma
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EXERCISE 10.2The Basic Types of Con
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EXERCISE 10.3Determining Strike and
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FIGURE 10.4 Block diagrams.Map view
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FIGURE 10.6 Block diagrams showing
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FIGURE 10.7 Hanging wall, footwall,
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is not the same as that of the beds
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EXERCISE 10.9Name:Course:Interpreti
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FIGURE 10.9 Geologic maps (continue
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EXERCISE 10.11Name:Course:Using Sym
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EXERCISE 10.12Name:Course:Construct
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EXERCISE 10.13Interpreting Simple G
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FIGURE 10.13 Structural control of
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10.6 Reading Real Geologic MapsYou
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FIGURE 10.14 (continued).Geologic M
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EXERCISE 10.18Making a Geologic Map
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GEOTOURS EXERCISE 10Name:Course:Und
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S-waves (FIG. 11.2b) are seismic wa
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FIGURE 11.4 Worldwide distribution
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FIGURE 11.5 Travel-time curves show
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EXERCISE 11.4Name:Course:Locating a
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EXERCISE 11.4Locating an Earthquake
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EXERCISE 11.4Name:Course:Locating a
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EXERCISE 11.5Name:Course:Determinin
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11.5 Predicting EarthquakeHazards:
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EXERCISE 11.7Locating Liquefaction
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After watching dramatic images of t
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APPENDIX 11.1Seismic Analysis Works
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LEARNINGOBJECTIVES■■Determine t
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EXERCISE 12.2Relative Ages in Cross
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Page 329 and 330: becoming extinct. When we find an i
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Page 333 and 334: FIGURE 12.9 Changing parent:daughte
Page 335 and 336: EXERCISE 12.7Putting It All Togethe
Page 337 and 338: EXERCISE 12.8What Numerical Ages Ca
Page 339 and 340: EXERCISE 12.9Correlation (continued
Page 341 and 342: EXERCISE 12.10Cretaceous Paleogeogr
Page 344 and 345: Landscapes Formed13by StreamsStream
Page 346 and 347: EXERCISE 13.1Differences between St
Page 348 and 349: EXERCISE 13.2Why Some Streams Meand
Page 350 and 351: RFIGURE 13.5 The Genesee River sout
Page 352 and 353: EXERCISE 13.2Why Some Streams Meand
Page 354 and 355: FIGURE 13.8 A floodplain and its as
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Page 360 and 361: FIGURE 13.13 Major drainage basins
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Page 364 and 365: EXERCISE 13.6Recognizing Stages of
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Page 368 and 369: 13.7 When Streams Don’t Seemto Fo
Page 370 and 371: EXERCISE 13.7Deducing the History o
Page 374 and 375: EXERCISE 13.9Estimating Potential F
Page 376 and 377: 13.9 Streams, Society, and the Envi
Page 382 and 383: Groundwater as aLandscape Formerand
Page 384 and 385: EXERCISE 14.1Factors Affecting Infi
Page 386 and 387: EXERCISE 14.1Name:Course:Factors Af
Page 388 and 389: FIGURE 14.2 Groundwater landscape e
Page 390 and 391: 60075000750600FIGURE 14.4 Karst top
Page 392 and 393: FIGURE 14.5 The water table separat
Page 394 and 395: EXERCISE 14.4Effects of a Changing
Page 396 and 397: 100100100FIGURE 14.9 Karst topograp
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Page 400 and 401: EXERCISE 14.7Name:Course:Environmen
Page 402 and 403: EXERCISE 14.8Name:Course:Environmen
Page 404 and 405: Glacial Landscapes15These jagged mo
Page 406 and 407: FIGURE 15.2 Mountain and continenta
Page 408 and 409: EXERCISE 15.1Comparison of Glaciers
Page 410 and 411: EXERCISE 15.3Erosional Features of
Page 412 and 413: 15.3.2 Depositional LandscapesLands
Page 414 and 415: EXERCISE 15.4Landforms at the Termi
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Page 418 and 419: 450400LEMON400ROADSLAYTON4504503Spo
Page 420 and 421: 15.4 Landscapes Producedby Mountain
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The base level for a tributary stre
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3700380036003900Northwest BasinLake
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FIGURE 15.17 Atmospheric temperatur
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GEOTOURS EXERCISE 15Flowing Ice as
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GRID: 10/inch = 39,4/10cm
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Processes and Landforms16in Arid En
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FIGURE 16.2 Types of arid regions.(
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16.2 Processes in Arid RegionsNow l
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16.3 Progressive Evolution of Arid
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EXERCISE 16.3Interpreting Arid Land
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EXERCISE 16.3Interpreting Arid Land
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RiverGila85WatermanWashR A I N B O
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85130011001000FIGURE 16.8 Topograph
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FIGURE 16.10 Characteristics and ev
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400040004000L o w e V a l l e y4100
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FIGURE 16.13 Vulnerability to deser
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Shoreline Landscapes17Coastlines co
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FIGURE 17.1 Types of shorelines.(a)
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EXERCISE 17.1Erodibility and Stabil
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17.2.5 Emergent and Submergent Shor
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1382427FIGURE 17.5 Maine coastline
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EXERCISE 17.5Measuring Sea-Level (a
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FIGURE 17.7 Area just south of Lake
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17.3.2 Coastal Erosion and Depositi
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FIGURE 17.11 Erosional features of
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EXERCISE 17.7Erosional Processes an
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17.3.5 Depositional FeaturesPromine
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EXERCISE 17.9Depositional Processes
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FIGURE 17.18 The shoreline of theno
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FIGURE 17.21 Aerial view showing ho
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EXERCISE 17.10Name:Course:Unintende
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FIGURE 17.24 Counterclockwise wind
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EXERCISE 17.11Name:Course:Effects o
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FIGURE 17.27 Flooding caused by hur
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EXERCISE 17.12Effects of Storm Path
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GEOTOURS EXERCISE 17Understanding T
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LEARNINGOBJECTIVES■ Explain why p
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EXERCISE 18.1Humans and Earth Syste
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EXERCISE 18.2Short-Term Changes in
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Weather describes atmospheric condi
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FIGURE 18.5 The greenhouse effect.G
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EXERCISE 18.3Name:Course:Assessing
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FIGURE 18.8 Movement of water from
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FIGURE 18.10 Projected sea-level sc
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EXERCISE 18.4Effects of Sea-Level R
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FIGURE 18.13 Estimated human popula
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FIGURE 18.14 Two bird species hunte
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EXERCISE 18.6Name:Course:How Quickl
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GEOTOURS EXERCISE 18Inducing Change
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Courtesy of Allan Ludman; p. 162 (t
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270 280260240 250290 300Clay310 320
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Align with northern latitude tick m
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