The planet we live on: The beginnings of the Earth Sciences

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Figure 1.37: A fossil trilobite, found in shallow sea sediment.23
Figure 1.38: Fossil ammonites, indicating sediments that <strong>we</strong>re deposited in the sea.compressed as the grains are compacted together and water is squeezed out. Meanwhilewaters flow through the pore spaces bet<strong>we</strong>en the grains and minerals crystallise fromthe water as cement. <strong>The</strong> effect of the two processes of compaction and cementation isthat the rocks become harder and the porosity is reduced. Porosity is a measure of theamount of pore space in the rock and, even after compaction and cementation, can stillbe as high as 20% in some sandstones and limestones. Since the pore spaces are largeenough for water and gas to flow through, these rocks are also permeable (permeabilityis a measure of how quickly a fluid can flow through a rock). Most mudstones and shalesare surprisingly often very porous, but because the pores are too small to allow fluids toflow through, they are often impermeable, i.e. the fluids cannot flow through the rock.<strong>The</strong> porosity and permeability that remains in the coarser grained sedimentary rocks afterdiagenesis is vital, because these rocks can contain underground water supplies and oiland gas, stored in the gaps bet<strong>we</strong>en the grains. You can investigate for yourself howrock porosity and permeability work using the ‘<strong>The</strong> space within: the porosity of rocks’and the ‘Modelling for rocks: What’s hidden inside - and why?’ practical activities fromthe http://www.earthlearningidea.com <strong>we</strong>bsite. <strong>The</strong>se show that, if you drop wateron to permeable porous rocks, it will soak in, but if a drop of water is put onto animpermeable rock, it will stay on the surface. You can also distinguish a permeable froman impermeable rock by putting them both in water. You might see a few small airbubbles on the surface of the impermeable rock but many more bubbles rise from thepermeable one as air bubbles rise out of the pore spaces at the top, and water flows in tofill the spaces at the bottom.Try to get a feel for how scientists use the clues from sedimentary rocks and fossils tointerpret the environments in which the sediments <strong>we</strong>re deposited by using the ‘What wasit like to be there - in the rocky world? and ‘What was it like to be there - bringing afossil to life’ activities from the http://www.earthlearningidea.com <strong>we</strong>bsite.24
Page 1 and 2: Basic Books in ScienceBook 6<strong
Page 3 and 4: BASIC BOOKS IN SCIENCE- a Series of
Page 5 and 6: BASIC BOOKS IN SCIENCE- a Series of
Page 7 and 8: Looking ahead - If you came across
Page 9 and 10: 3.2 Plate tectonics (20th Century)
Page 11 and 12: 1.30 Coal seams in an opencast coal
Page 13 and 14: 3.4 Alfred Wegener, the polar explo
Page 15 and 16: 5.14 A GPS remote volcano monitorin
Page 17 and 18: Figure 1.2:minerals.A sandstone roc
Page 19 and 20: Even diamond can have different col
Page 21 and 22: Figure 1.8: A red garnet crystal in
Page 23 and 24: Figure 1.12: Crystals of minerals i
Page 25 and 26: Hematite, Fe 2 O 3 - earthy red, me
Page 27 and 28: Figure 1.17: Sedimentary rocks show
Page 29 and 30: Figure 1.20: A close up view of a p
Page 31 and 32: Figure 1.26: Ancient wave ripple ma
Page 33 and 34: Figure 1.30: Coal seams in an openc
Page 35 and 36: Figure 1.32: Close up view of a pie
Page 37: Figure 1.35: A fossil colonial cora
Page 41 and 42: Figure 1.39: ‘Massive’ igneous
Page 43 and 44: Figure 1.41: A close up view of a p
Page 45 and 46: Figure 1.44: A basalt flow that coo
Page 47 and 48: Figure 1.47: Deposit of volcanic as
Page 49 and 50: Figure 1.49: An old slate quarry, s
Page 51 and 52: Figure 1.51: Slate, a low-grade met
Page 53 and 54: Figure 1.53: Schist, a medium-grade
Page 55 and 56: Figure 1.56: Metaquartzite, produce
Page 57 and 58: Figure 1.58: A region of folded roc
Page 59 and 60: Figure 1.61: A normal fault. This s
Page 61 and 62: Figure 1.64: An unconformity. Older
Page 63 and 64: proper geological maps. Fossils hav
Page 65 and 66: Cephalopods are not extinct, but th
Page 67 and 68: Figure 1.68: A shelled cephalopod f
Page 69 and 70: You can try the rock sequencing pri
Page 71 and 72: Chapter 2Reading landscapes: how la
Page 73 and 74: Figure 2.3: Rock fragments loosened
Page 75 and 76: Figure 2.6: The jo
Page 77 and 78: Figure 2.10: The m
Page 79 and 80: are forming them. Similarly the sha
Page 81 and 82: Figure 2.19: This photo was taken f
Page 83 and 84: Figure 2.25: Dinosaur tracks conser
Page 85 and 86: • On coastal sections, whenever p
Page 87 and 88: found evidence that the Earth was a
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Figure 3.3: James Hutton, the ‘Fo
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Figure 3.5: A page of Wegener’s 1
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Figure 3.7: The st
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Figure 3.10: The r
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Figure 3.13: The m
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Figure 3.15: The S
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Figure 3.19: An ocean versus contin
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Figure 3.23: Map of the major tecto
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Figure 3.26: Global temperature cha
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Figure 3.29: A computer generated p
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Figure 3.31: The
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planet extended th
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Figure 4.1: William Smith’s geolo
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Millionsof yearsago (Ma)01000Some M
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ocks whilst the first definite plan
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Figure 4.9: The ch
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Figure 4.12: The 4
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Millionsof years Some Major Earth E
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Figure 5.2: Strike-slip movement (r
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Figure 5.4: The So
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Figure 5.6: An ash eruption rising
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Figure 5.10: A hazard zone map of t
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isk to humans. The
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Figure 5.14: A GPS (global satellit
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None of these methods has yet prove
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Figure 5.17: A windfarm in Ireland.
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Figure 5.19: A beautifully preserve
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Another ‘missing link’ find has
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Figure 5.22: A dinosaur reconstruct
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Figure 5.25: A working aggregate-pr
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Figure 5.26: The E
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Chapter 6Understanding what geologi
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Figure 6.2: A drilling rig used for
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When an oil/gas field has been foun
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Figure 6.6: Groundwater flowing out
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Dam disaster in Italy, when the wav
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Figure 6.10: A slab foundation, bui
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An example of this is investigation
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GlossaryAbsolute age The</s
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Carbon capture The
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Crustal shortening This results of
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Evaporite deposits (or evaporites)
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Geophysical survey Using the method
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“Integrated waste management” <
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Metamorphism The r
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Pore spaces (or pores) Gaps bet<str
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Saltation Sediment movement by flui
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Suspension Sediment movement by flu
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AcknowledgementsPermission to repri
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Figure 2.3 A scree slope. Photo ID:
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Figure 1.15a Hematite.Figure 1.15b
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Figure 1.28 Dune cross bedding in s
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Figure 3.18 An island arc volcano,
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Figure 5.21 Excavations at the dino
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The planet we live on: The beginnings of the Earth Sciences

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