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9 0 / 9 / 0 330/9/09 11:46:10 Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc. Plate Tectonics 2 8
2 8 i . 6 3 4 1 Wegener suggested that these continents were covered by a large ice sheet. suggested that these continents were Wegener is where the climate all these continents except one are near the equator, Today, warm enough to melt ice sheets. The hypothesis that suggests that continents are in constant motion on Earth’s are in constant motion on Earth’s that suggests that continents The hypothesis drift. surface is continental Over time, Pangaea started breaking apart, and the continents started moving the continents started moving started breaking apart, and Over time, Pangaea where they are now. to 9 8 _ t u Evidence of continental drift also includes rocks on different continents that have continents that have Evidence of continental drift also includes rocks on different geologic structure, and age. similar or identical chemistry, mountains would If you pushed North America and Europe together again, their look like one long belt with the same rock types. Glacial grooves on continents that currently have warm climates show that these show that these Glacial grooves on continents that currently have warm climates continents once had cold climates. observed that there were mountains and rocks on different continents Wegener that shared common origins. Wegener proposed that certain continents—including South America and South America and proposed that certain continents—including Wegener Pole 250 million years ago. Australia—were closer to the South a. b. Fossils of plants and animals that lived in wet, warm climates are in areas that now lived in wet, warm climates are in areas that now Fossils of plants and animals that have cold climates. fossilized plants are evidence of continental drift. The Deposits of coal in Antarctica was once near the equator. in these deposits show that Antarctica Fossils of ancient plants and animals provide evidence for continental drift. Fossils of ancient plants and animals animals are present on different continents that Remains of the same plants and are now separated by oceans. Wegener observed that were of coastlines between continents the similarities Wegener separated by oceans. Pangaea have coasts that fit together like pieces The continents that once formed of a(n) puzzle. called Pangaea. a. b. The German scientist Alfred Wegener studied whether Earth’s continents move. continents whether Earth’s studied Wegener scientist Alfred The German single supercontinent were once part of a proposed that all continents Wegener O s n A _ F Evidence That Continents Move Pangaea R
C _ 8. 9. 6. 7. 5. 3. 4. 1. 2. 3. 4. 1. 2. 7 T2 B. Lesson 1: The Continental Drift Hypothesis Continental The 1: Lesson A. Lesson Outline for Teaching Outline for Lesson 8 0 _ 2 8 0 _ 2 3 1 CC132_082_087_CRF_AnsOut_891436.i82 82 CC132_082_087_CRF_AnsOut_891436.i83 83 1 3 2 _ 0 8 2 _ 0 8 7 _ C R
F Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc. _ A n s O u t Plate Tectonics Plate Tectonics likely thatAfricaandSouthAmericamighthavesimilarfossils. next toeachotherinPangaea.AsiaandSouthAmericadidnottouch.Therefore,itismore According totheshapesoftheirshorelines,itislikelythatAfricaandSouthAmericawere America? Are similarfossilsmorelikelytoexistonAsiaandSouthAmericaorAfrica Discussion Question C. Lesson continued Outline _ 8 4. 3. 2. 1. 9 1 4 What wasmissing? 3 6 . i 8 3
Evidence toprovecontinentaldriftwasdiscusseddecadesafterWegener’s death. between thedriftingcontinents. Additional scientificevidencetoproveWegener’s hypothesisexistedontheseafloor Wegener couldnotexplainwhatforces causesthecontinentstomove. were unabletomeasurehowfastthecontinentsmoved. Scientists questionedcontinentaldriftbecauseitissucha(n)slowprocess.They 8 3 T3 330/9/09 11:46:11 0 / 9 / 0 9
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