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lava


melted rock that reaches Earth’s surface

Volcanoes spew lava that forms burning lakes of melted rock.

  lava

tectonic plate


slow-moving, giant rock slab that makes up Earth’s crust, or outer layer

The African continent sits on a tectonic plate called the African plate.

  tectonic plate

fault


crack in Earth’s surface where movement takes place

Earthquakes can occur when rocks slide past each other at a fault.

fault

acidic


having the properties of an acid, a substance that tends to eat away at other substances

Acids, like lemon juice, can eat away at other substances.

  acidic

evaporate


to change from liquid to gas

The rain puddles evaporated.

  evaporate
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