1 The Tectonic Cycle The internal structure of the Earth

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Presentation transcript:

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

Chapter 1: The Tectonic Cycle Four layers make up the Earth Crust Mantle Outer core Inner core

Chapter 1: The Tectonic Cycle 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)