What are earth's three main layers?

• Core, mantle, and surface

• Core, mantle, and crust

• Inner core, outer core, and mantle

• Upper mantle, lower mantle, and crust

What do earthquake waves have in common with other waves?

• They travel at the same speed as light waves

• They carry the same amount of energy as sound waves

• They bend when they travel through different materials

• They have the same wavelength as radio waves

Where is the earth's crust the thickest?

• 
• 
• 
• 

Which word BEST characterizes the lower mantle?

• Very hot

• Cool

• Chilled

• Slightly warm

How deep would you have to drill to reach the center of the earth?

• About 60,000 kilometers

• About 600,000 kilometers

• About 600 kilometers

• About 6,000 kilometers

What effect does the spinning of the earth's core have?

• It creates gravity

• It creates matter

• It creates mass

• It creates the earth's magnetic field

Which of the following statements about the Earth's inner core is TRUE?

• It's mostly made of iron

• It's mostly made of nickel

• It's mostly made of cadmium

• It's mostly made of magnesium

What is the only entirely liquid layer of the earth?

• The upper mantle

• The outer core

• The inner core

• The lower mantle

Which of the following statements is an OPINION about the mantle?

• It makes up the bulk of the earth's mas

• Heat churns through it

• It contains iron, silicon, magnesium, and oxygen

• It is the most important layer of the earth

If the earth's mantle were completely solid, __________ plates could not move around.

• Tectonic

• Technical

• Titanic

• Agnostic