Rocks Review

What is the outer layer of the Earth made of?

• Hot liquid

• Hard rock

• Metal

• Crystals

Which layer of the Earth has hot, melted rock (magma)?

• Crust

• Mantle

• Outer core

• Inner core

What is the difference between intrusive and extrusive igneous rocks?

• Intrusive rocks form inside the Earth; extrusive rocks form outside

• Intrusive rocks cool slowly; extrusive rocks cool fast

• Intrusive rocks have big crystals; extrusive rocks have small crystals

• All of the above

What helps crystals in igneous rocks grow bigger?

• Cooling fast

• Cooling slowly

• Wind

• Pressure

The word "igneous" means:

• Water

• Fire

• Metal

• Earth

__________ igneous rocks form when lava cools fast on the Earth's surface.

• extrusive

• intrusive

• plutonic

• hypabyssal

Crystals in igneous rocks are made of different __________.

• minerals

• elements

• compounds

• gases

The __________ core is solid, even though it is very hot.

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When magma turns into solid rock, it is called __________.

• igneous rock

• sedimentary rock

• metamorphic rock

• sandstone

The __________ core is made of liquid iron and metal.

• outer

• inner

• mantle

• crust