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Earth's crust

Earth's outermost layer of rock

Sedimentary rock

Rock formed when chemical reactions cement sediments together, hardening them

Igneous rock

Rock that forms from molten rock

Metamorphic rock

Igneous or sedimentary rock that has been changed into a new kind of rock as a result of great pressure and temperature

Plastic rock

Rock that behaves like something between a liquid and a solid

Earthquake

Vibration of the earth that results from either volcanic activity or rock masses suddenly moving along a fault

Fault

the boundary between two sections of rock that can move relative to one another

Focus

the point where an earthquake begins

Epicenter

the point on the surface of the earth directly above an earthquake's focus

Sediment

Small, solid fragments of rock and other materials that are carried and deposited by wind, water, or ice. Examples would be sand, mud, or gravel.