EARTH SCIENCE
TECTONICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Glacial erosion patterns on different continents match up.
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Sedimentary layers are always found in horizontal positions.
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Volcanic chains on one continent match those on other continents.
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Continents are all made from one type of rock.
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Detailed explanation-1: -One type of evidence that strongly supported the Theory of Continental Drift is the fossil record. Scientists have found fossils of similar types of plants and animals in rocks of similar age. These rocks were on the shores of different continents. This suggests that the continents were once joined.
Detailed explanation-2: -Glacial striations (scratches) and erratics (rocks moved away by glacial ice from original bedrock) correspond between continents. Some distinctive fossils found on the southern continents indicate that they came from one ancient single continent.
Detailed explanation-3: -In the early 20th century, a scientific theory called continental drift was proposed about this migration of the continents. That theory was initially ridiculed, but it paved the way for another theory called plate tectonics that scientists have now accepted to explain how Earth’s continents move.
Detailed explanation-4: -Wegener used fossil evidence to support his continental drift hypothesis. The fossils of these organisms are found on lands that are now far apart. Grooves and rock deposits left by ancient glaciers are found today on different continents very close to the equator.
Detailed explanation-5: -The ‘same animal fossils’ found on different continents provide evidence climatic change on continent supporting the theory of ‘continental drift’.