Earth's Structure & Continental Drift Review

Front

Which type of crust is denser, continental or oceanic?

Back

Oceanic crust is denser than continental crust.

Front

What is the rigid layer of the Earth made up of the crust and upper mantle called?

Back

The rigid layer is called the lithosphere.

Front

What is the main evidence used to support the continental drift theory?

Back

The main evidence includes matching shapes of coastlines and the distribution of fossils and rock formations.

Front

What are the 4 main layers of the Earth?

Back

The 4 main layers are crust, mantle, inner core, and outer core.

Front

What is the main difference between continental and oceanic crust?

Back

The main difference is in their composition and thickness.

Front

What is the composition of continental crust?

Back

Continental crust is primarily composed of granitic rocks.

Front

What is the composition of oceanic crust?

Back

Oceanic crust is primarily composed of basaltic rocks.

Front

What layer of the Earth lies beneath the lithosphere?

Back

The layer beneath the lithosphere is called the asthenosphere.

Front

What is the asthenosphere?

Back

The asthenosphere is a semi-fluid layer of the upper mantle that allows tectonic plates to move.

Front

What is the outer core made of?

Back

The outer core is made of liquid iron and nickel.