the internal structure of the earth the internal structure of the earth 1 the tectonic cycle the...
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The internal structure of the EarthThe internal structure of the Earth
1 The Tectonic Cycle1 The Tectonic Cycle
The Earth’s crustThe Earth’s crust
Chapter 1: The Tectonic Cycle
Four layers make up the Earth
Crust
Mantle
Outer core
Inner core
Lithosphere
Earth’s crust and solid upper mantle
Asthenosphere
Partially melted Lithosphere floats on top
Chapter 1: The Tectonic Cycle
Continental crust
Thick, averaging between 30 km and 70 km in thickness
Made up of light rocks, e.g. granite
Made from silica and alumina (SIAL)
Chapter 1: The Tectonic Cycle
Oceanic crust
Thinner than the continental crust, averaging between 3 km
and 10 km
Made up of heavy rocks, e.g. basalt
Made from silica and magnesium (SIMA)
Chapter 1: The Tectonic Cycle
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