Earth's Crust

Front

What does the term 'crust' describe?

Back

The outermost shell of a terrestrial planet.

Front

How deep is Earth's crust?

Back

40 kilometers (25 miles) deep.

Front

What percentage of Earth's mass does the crust make up?

Back

Just 1 percent of Earth's mass.

Front

What does Earth's crust contain?

Back

All known life in the universe.

Front

What are the three layers of Earth?

Back

The crust, the mantle, and the core.

Front

What is the Earth's crust made of?

Back

Solid rocks and minerals.