The Structure of the Earth - C2a

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  • Created by: iram_f
  • Created on: 22-11-14 22:47
What is the lithosphere?
The Earth's crust and its upper mantle form the rigid lithosphere, consisting of the tectonic plates.
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What are the different types of lava and where are they found?
Iron-rich (basaltic) lava is runny and are emitted from generally 'safe' volcanoes as the lava gently spills out. Silica-rich lava is viscous and produces violent eruptions. If the lava cools quickly it forms the rock rhyolite.
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How does plate tectonics work?
Radioactive waste from the inner core creates energy that permeates into the mantle, causing convection currents which move the plates. If an oceanic plate and continental plate meet subduction occurs.
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How did Wegener's continental drift theory develop?
In 1914 Wegener proposed that a supercontinent had existed, yet he had no substantial evidence except for the match between South America & Africa. But when sea-floor spreading, fossil and plant proof was discovered the theory was accepted.
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Why do geologists study volcanoes?
To be able to forecast future eruptions, thus saving lives, and to find out about the structure of the Earth.
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Other cards in this set

Card 2

Front

What are the different types of lava and where are they found?

Back

Iron-rich (basaltic) lava is runny and are emitted from generally 'safe' volcanoes as the lava gently spills out. Silica-rich lava is viscous and produces violent eruptions. If the lava cools quickly it forms the rock rhyolite.

Card 3

Front

How does plate tectonics work?

Back

Preview of the front of card 3

Card 4

Front

How did Wegener's continental drift theory develop?

Back

Preview of the front of card 4

Card 5

Front

Why do geologists study volcanoes?

Back

Preview of the front of card 5

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