Which main layer lies between the crust and the core?

• Crust
• Core
• Mantle

What are Earth's three main layers called?

• Soil, stones, and sea water
• Crust, mantle, and core
• Clouds, rivers, and mountains

Some rock below Earth's surface can melt.

Circle one:   True   False

Rae draws the whole mantle as liquid rock. Which change would make the drawing fit Earth better?

• Show only liquid rock because the mantle is hot.
• Show hot rock that is mostly solid.
• Show only cold rock because solid rock cannot be hot.

How does the crust's thickness compare with the mantle and core?

• It is much thinner than the mantle and core.
• It is much thicker than the mantle and core.
• It is just as thick as the mantle and the core.

Earth's core is made mostly of rock, just like the mantle.

Circle one:   True   False

Omar uses an egg yolk to stand for Earth's core. He says the core must be made of yolk too. Which answer checks his model?

• The yolk shows the core's place, not its metal.
• The yolk shows Earth's core is made of cooked egg.
• The yolk shows Earth's core lies outside the crust.

Zoe labels the outer core solid metal and the inner core liquid metal. Which pair of labels would match Earth?

• Solid metal outside, liquid metal inside.
• Liquid metal outside, liquid metal inside.
• Liquid metal outside, solid metal inside.