Structure of the earth

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  • Created by: Emanuelle
  • Created on: 09-06-16 19:06
How do plates move?
The oceanic plate has a higher density than the continental plate, so when it collides with the continental plate, it dips down and slides under it. This is called Subduction which moves the plates
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What is Wegener's theory?
Wegener's theory suggests that the plates used to be lumped together into one continent (Pangeia).
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What does Wegener's theory suggest?
That all of the continents seem to fit together like a jigsaw puzzle, the geology of Scotland and Canada are the same, as with the geology of Africa and South America and similar species were found on different continents.
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How has Wegener's theory gradually been accepted?
The age of the rock on the ground increases as you move away and the plates are moving apart from each other because of new rock being made.
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Why do scientists study volcanoes?
To predict when the volcanoes are next going to erupt to provide an early warning to people living near, to have better understanding of the earth's structure.
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Where do volcanoes form?
Volcanoes form where the crust is thin, so the mantle rises through as it has a lower density, creating volcanoes.
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What are the pros and cons of volcanoes?
Pros: Fertile soil for planting and growing crops for food, provides information about the structure of the earth. Cons: Dangerous as volcanoes could still be active.
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What are the properties of Iron rich basalt and Silica rich Rhyolite?
Iron rich basalt: fairly safe eruptions and quite safe. Silica rich rhyolite: Thick lava and results in a more violent and catastrophic eruption.
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What is meant by thin and thick lava and it's crystals?
Thin lava: lava that is not as hazardous and violent, cools quickly and has small crystals (as in iron rich basalt). Thick lava: More violent and catastrophic, cools slowly and forms large crystals (as in silica rich rhyolite)
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What is Wegener's theory?

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Wegener's theory suggests that the plates used to be lumped together into one continent (Pangeia).

Card 3

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What does Wegener's theory suggest?

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Card 4

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How has Wegener's theory gradually been accepted?

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Card 5

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Why do scientists study volcanoes?

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