Makes rock layers shift up or down.

A hardened layer of lava on the surface.

The surface where new rock layers meet a much older rocksurface beneath them.

The age of rock compared with other rocks.

The way to determine relative ages of rocks.

A hardened layer of magma under the earth's crust.

The number of years since a rock has formed.

Fossils that helps geologists match rocks.

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Term	Definition
Fault	Makes rock layers shift up or down.
Extrusion	A hardened layer of lava on the surface.
Unconformity	The surface where new rock layers meet a much older rocksurface beneath them.
Relative Age	The age of rock compared with other rocks.
Law of Superposition	The way to determine relative ages of rocks.
Intrusion	A hardened layer of magma under the earth's crust.
Absolute age	The number of years since a rock has formed.
Index fossil	Fossils that helps geologists match rocks.