Earth's Crust and Plate Tectonics

The video explains the structure of Earth's plates, focusing on the lithosphere and asthenosphere. It describes the differences between oceanic and continental crusts, highlighting their composition, density, and location. The oceanic crust is thinner and denser, composed mainly of basalt, while the continental crust is thicker, less dense, and primarily made of granite.

What are the Earth's plates made of?

• The asthenosphere and the lithosphere

• The crust and the rigid upper mantle

• The core and the mantle

• The oceanic and continental crust

What is the primary function of the asthenosphere?

• To flow and move the Earth's plates

• To create oceanic crust

• To form the Earth's core

• To support the lithosphere

Which layer is located above the asthenosphere?

• The core

• The continental crust

• The lithosphere

• The oceanic crust

What is the primary composition of the oceanic crust?

• Iron and nickel

• Basaltic rocks with silicon and magnesium

• Granite rich in silicon and oxygen

• Sandstone and limestone

Why does the oceanic crust sink beneath the continental crust?

• It is older

• It is more dense

• It is thicker

• It is less dense

What is a characteristic feature of the continental crust?

• It is primarily composed of basalt

• It is where mountains and volcanoes are found

• It is denser than the oceanic crust

• It is thinner than the oceanic crust

What makes the continental crust float higher than the oceanic crust?

• It is composed of basalt

• It is more dense

• It is located beneath the ocean

• It is less dense

Which mineral content is primarily found in the continental crust?

• Silicon and oxygen

• Iron and nickel

• Calcium and carbon

• Silicon and magnesium