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21. Explain why mass movement is more commonafter a heavy rainfall.22. Describe how climate affects the developmentof soils.23. Explain how some mass movement could beprevented.24. Describe why chemical weathering wouldnot be rapid in Antarctica.25. Describe why caves form only in certaintypes of rock.26. Recognize Cause and Effect Explain how watercreates stream valleys.27. Form hypotheses about how deeply watercould erode and about how deeply glacierscould erode.28. Recognize Cause and Effect Explain how valleyglaciers create U-shaped valleys.29. Classify the following by the agent thatdeposits each: sand dune, delta, till, andloess.30. Concept Map Copy and complete the conceptmap showing the different types ofmass movements.31. Poster Use photographs from old magazinesto make a poster that illustrates differentkinds of weathering and erosion.Display your poster in your classroom.32. Model Use polystyrene, cardboard, and clayto make a model of a glacier. Include astream of meltwater leading away from theglacier. Use markers to label the areas oferosion and deposition. Show and labelareas where till and outwash sedimentscould be found. Display your model inyour classroom.Use the table below to answer questions 33–34.Loss and Formation of TopsoilYears SoilErodesTopsoil Lost (cm)Years to Re-createSoil Lost10 1 50015 1.520 2Do not write25 2.5in this book.30 340 4.5Soil particlesmove slowlydownhill.SlumpMass MovementWetsediment flowsdownhill.Rock slide33. Formation of Topsoil In a given region, it takes500 years to form 1 cm of topsoil. For the past20 years, the area has lost 1 cm of topsoil every10 years because of erosion. If erosion stopstoday, how long will it take to re-create the losttopsoil? How long will it take to re-create thetopsoil lost in 15, 25, and 30 years?34. Weather’s Affect In the 30th year, climatechanges and precipitation increases, causing anew erosion rate of 1.5 cm every 10 years. Howmany years will it now take to re-create thetopsoil lost at the end of 40 years?red.msscience.com/chapter_reviewCHAPTER REVIEW 337