1. The rocky outer layer of the Earth.
CRUST
The rocky outer layer of the Earth.

2. Thick layer of hot but solid rock beneath Earth’s crust.
MANTLE
Thick layer of hot but solid rock beneath Earth’s crust.

3. Large sphere of metal at Earth’s center.
CORE
Large sphere of metal at Earth’s center.

4. A solid combination of minerals or other materials.
ROCK
A solid combination of minerals or other materials.

5. Rock that forms from magma or lava that cools and hardens.
IGNEOUS ROCK
Rock that forms from magma or lava that cools and hardens.

6. MAGMA
Molten rock, or a mixture of molten rock and gases, including water vapor, that is underground.

7. Magma that flows over Earth’s surface.
LAVA
Magma that flows over Earth’s surface.

8. Igneous rock that cools underground from hardened magma.
INTRUSIVE ROCK
Igneous rock that cools underground from hardened magma.

9. Igneous rock that forms at Earth’s surface from lava.
EXTRUSIVE ROCK
Igneous rock that forms at Earth’s surface from lava.

10. SEDIMENTARY ROCK
Rock that forms over time as sediment is squeezed and cemented together.

11. METAMORPHIC ROCK
Rock that has been changed by temperature, pressure or reactions with water and chemicals.