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The internal structure of the Earth The internal structure of the Earth 1 The Tectonic Cycle The Earth’s crust The Earth’s crust

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Page 1: The internal structure of the Earth The internal structure of the Earth 1 The Tectonic Cycle The Earth’s crust

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

Page 2: The internal structure of the Earth The internal structure of the Earth 1 The Tectonic Cycle The Earth’s crust

Chapter 1: The Tectonic Cycle

Four layers make up the Earth

Crust

Mantle

Outer core

Inner core

Page 3: The internal structure of the Earth The internal structure of the Earth 1 The Tectonic Cycle The Earth’s crust

Lithosphere

Earth’s crust and solid upper mantle

Asthenosphere

Partially melted Lithosphere floats on top

Chapter 1: The Tectonic Cycle

Page 4: The internal structure of the Earth The internal structure of the Earth 1 The Tectonic Cycle The Earth’s crust

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

Page 5: The internal structure of the Earth The internal structure of the Earth 1 The Tectonic Cycle The Earth’s crust

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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