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What is the thinnest layer?

• Crust

• Mantle

• Outer Core

• Inner Core

What is the thickest layer?

• Crust

• Mantle

• Outer Core

• Inner Core

What is the coolest layer?

• Crust

• Mantle

• Outer Core

• Inner Core

What is the hottest layer?

• Crust

• Mantle

• Outer Core

• Inner Core

What is the densest layer?

• Crust

• Mantle

• Outer Core

• Inner Core

Which layer is the only liquid layer?

• Crust

• Mantle

• Outer Core

• Inner Core

Which layer is made of solid Iron and nickel?

• Crust

• Mantle

• Outer Core

• Inner Core

Which layer is made of liquid iron and nickel?

• Crust

• Mantle

• Outer Core

• Inner Core

What are convection currents?

• the cycle of heated rock or metal rising, and cooling rock or metal falling.

• the cycle of cooling rock or metal rising, and heated rock or metal falling.

• an electric current found in the mantle.

• and electric current found in the outer core.

If we can't travel to the center of the Earth, how do we know so much about it?

• Seismic waves, made by earthquakes and man-made explosions

• special camera scopes sent through all the layers of the earth

• very long thermometers that can reach to the inner core

• super powerful x-rays