Drifting of Continents and Plate Tectonics — Flashcards
ICSE · Class 11 · Geography
34 flashcards for Drifting of Continents and Plate Tectonics (ICSE Class 11 Geography) to test yourself on key terms and facts.
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What is Wegener’s Continental Drift Theory?
Answer
It is the idea that the continents were once joined together as one supercontinent and later drifted apart. Wegener put forward this theory in 1912 and revised it in 1924. He was mainly a meteorologis…
What is Pangaea?
Answer
Pangaea was the supercontinent formed by the aggregation of continental landmasses in the upper Carboniferous period. It was surrounded by Panthalasa, the vast ocean. The idea of Pangaea explains how …
What were Laurasia and Gondwanaland?
Answer
Laurasia was the northern part of Pangaea and included North America, Europe, and Asia. Gondwanaland was the southern part of Pangaea and included South America, Africa, Peninsular India, Australia, a…
What is the jig-saw-fit evidence used in continental drift?
Answer
The jig-saw-fit refers to the close matching of the coastlines of continents, especially around the Atlantic Ocean. Wegener noticed that the eastern coast of South America and the western coast of Afr…
What is the main criticism of the jig-saw-fit argument?
Answer
If South America and Africa are brought close together, their coasts leave a gap of about 15 degrees. This means the fit is not perfectly complete. That gap became one of the objections raised against…
What is the evidence from mountain belts for continental drift?
Answer
An ancient mountain belt, 470 to 350 million years old, is found on both sides of the Atlantic Ocean. These mountains were once part of a continuous belt of geological activity. Their present separati…
How do fossils support continental drift?
Answer
Fossils of Glassopteris, Mesosurus, and Lystrosaurus have been found in widely separated lands such as India, Australia, South Africa, South America, Falkland Islands, and Antarctica. Such a distribut…
Why is the distribution of Glassopteris flora important in the drift theory?
Answer
Glassopteris flora was used as a strong fossil clue for continental drift because it appears in several southern landmasses that are now far apart. Philip Lake later pointed out that it is also found …
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