Layers of the Earth

Front

What are the four main layers of the Earth?

Back

Crust, Mantle, Outer Core, Inner Core

Front

What is the outermost layer of the Earth called?

Back

Crust

Front

What is the layer beneath the crust?

Back

Mantle

Front

What is the composition of the inner core?

Back

Solid iron and nickel

Front

What is the composition of the outer core?

Back

Liquid iron and nickel

Front

Which layer of the Earth is responsible for tectonic activity?

Back

Crust

Front

What is the temperature of the inner core?

Back

Approximately 5,000 to 7,000 degrees Celsius

Front

What is the primary characteristic of the mantle?

Back

It is semi-solid and can flow slowly.

Front

How thick is the Earth's crust on average?

Back

About 30 kilometers (18.6 miles) thick.

Front

What is the main difference between the outer core and inner core?

Back

The outer core is liquid, while the inner core is solid.