Plate Tectonics & Associated Hazards

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Who proposed the theory that the Earth was once one continent?
Wegner
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How long ago was the Earth's surface all one continent?
300 million years ago
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What was the super continent called?
Pangea
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Later, what did the super continent split into?
North continent (Laurasia) and South Continent (Gondwanaland)
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What is the inner layer of the Earth called?
The crust
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What is the crust made up of?
Dense rocks containing nickel and iron alloys
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What is the core divided into?
A solid inner core and a molten outer core
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What is the estimated temperature of the core?
Over 5,000 degrees Celsius
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What is the mantle made from?
Molten and semi-molten rocks containing lighter elements e.g. silicon and oxygen
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What is the crust made of?
Even lighter rock and elements e.g. silicon, oxygen, aluminium, potassium and sodium
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What would the thickness of the crust be under the sea?
6-10km thick
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What would the thickness of the crust be under the continents?
30-40 km thick
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What would the thickness of the crust be under the highest mountain ranges?
70 km thick
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What is the upper mantle divided into?
The lithosphere and the asthenosphere?
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What does the lithosphere consist of?
The crust and the rigid upper section of the mantle
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How thick is the lithosphere approximately?
80-90 km thick
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What is the lithosphere divided into?
7 large plates and a number of smaller ones
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What two categories are plates divided into?
Oceanic and Continental
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What is the difference between an oceanic and continental plate?
What they are made from
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What is the asthenosphere?
Semi-molten rock on which plates float and move due to convection currents
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Other cards in this set

Card 2

Front

How long ago was the Earth's surface all one continent?

Back

300 million years ago

Card 3

Front

What was the super continent called?

Back

Preview of the front of card 3

Card 4

Front

Later, what did the super continent split into?

Back

Preview of the front of card 4

Card 5

Front

What is the inner layer of the Earth called?

Back

Preview of the front of card 5
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