Planet Earth's structure consists of 4 layers. Select all correct layers.

• Crust

• Mantle

• Outer Core

• Inner Core

• Peel

The crust of the Earth consists of ___________ 'floating' on top of the ___________.

• Tectonic plates / Mantle

• Tectonic plates / Ocean

• Dinner Plates / Soapy Water

• Crust / Filling

The Earth's atmosphere is very thin. If Earth is compared to an apple, the atmosphere would only be as thick as the peel of the apple.

• True

• False

The ozone layer protects living organisms from harmful UV radiation.

• True

• False

Earth's atmosphere is held in place because....

• The nitrogen, oxygen, and other atmospheric gases make it sticky.

• Earth's gravity keeps it from flying off into space.

• Clouds hold the atmosphere down.

Earthquakes are caused by...

• elephants jumping up and down at once.

• landslides

• moving tectonic plates rubbing together

• enormous gas bubbles in Earth's mantle

The atmosphere is essential for the movement of water on Earth. Without it, 'The Water Cycle' wouldn't work.

• True

• False

Why isn't the surface of Planet Earth just a cold space rock?

• The Earth's core is so hot that it keeps sending heat to the surface. The core works like a car heater.

• Aliens charge our batteries every 50 years.

• Earth's greenhouse effect traps some of the Sun's heat radiation. The atmosphere works like a blanket.

What are the two categories that forces can be divided into? Choose TWO answers.

• Contact forces

• Jedi forces

• Remote forces

• Sith forces

What is one example of a remote force?