Crust

The Earth's crust is a chemically distinct layer from the mantle, formed when molten rock cooled early in the planet's history. It is up to 70 kilometers thick, with the continental crust mainly composed of granite and the oceanic crust of basalt.

What makes the Earth's crust distinct from the mantle beneath it?

• Its chemical composition

• Its temperature

• Its color

• Its magnetic field

How did the Earth's crust form?

• Through volcanic eruptions

• By cooling of molten rock

• By accumulation of sediments

• Through tectonic movements

What is the maximum thickness of the Earth's crust?

• 50 kilometers

• 80 kilometers

• 70 kilometers

• 60 kilometers

What is the primary composition of the continental crust?

• Basalt

• Granite

• Sandstone

• Limestone

What type of rock primarily makes up the oceanic crust?

• Granite

• Basalt

• Shale

• Marble