The Structure of the Earth

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  • Created by: 12WrighH
  • Created on: 14-03-18 13:30
Who first proposed the theory about the Earth's structure?
Edmond Halley
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What is the crust?
The outer layer of the Earth in which we live on
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What is the thickness of the crust?
Between 5 to 10km under oceans, and up to 70km under continents
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What are the two types of crust?
Oceanic and continental
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What is oceanic crust?
An occasional broken layer of basaltic rocks known as sima (silica and magnesium)
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What is continental crust?
Bodies of mainly granitic rocks known as sial (silica and aluminium)
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What is the lithosphere?
The zone that tectonics are formed, the crust and upper mantle together
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What is the mantle?
This it the widest section of the Earth
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How thick is the mantle?
2900km
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What state are the rocks in?
Silicate rocks are in a thick, liquid state, which becomes denser with depth
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What is the asthenosphere?
Part of the upper mantle, where rocks are rheid
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What happens to density as you go down into the lower mantle?
It increases
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What is the core?
The centre and hottest part of the Earth
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What temperatures can the core reach?
5000 degrees celcius
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What is the core made up of?
Mainly iron and nickle
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How dense is the core?
Four times as dense as the crust
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What is the core split up into?
The outer core and the inner core
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What is a major cause for the Earth's activity?
The core's internal heat
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What is the greatest source of heat energy within the Earth?
Radioactivity- Decay of Uranium, Thorium, Potassium, etc..
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What are the currents called which are partly responsible for plate movement?
Convection currents
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Other cards in this set

Card 2

Front

What is the crust?

Back

The outer layer of the Earth in which we live on

Card 3

Front

What is the thickness of the crust?

Back

Preview of the front of card 3

Card 4

Front

What are the two types of crust?

Back

Preview of the front of card 4

Card 5

Front

What is oceanic crust?

Back

Preview of the front of card 5
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