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13 Cards in this Set

  • Front
  • Back

Relative Age

The age of a rock compared to the ages of other rocks

Absolute Age

The number of years since a rock has been formed

Law of Superposition

The law that says that all rocks are older than the rock above it and the rock is younger than the rock below it

Extrusion

A rock layer that is formed when lava flows onto Earth's surface and hardens

Intrusion

A rock layer formed when lava hardens below Earth's surface

Fault

A break or crack in Earth's surface where the rocks move

Unconformity

A place where old eroded rock touches new rock layers

Index Fossil

Fossils that are widely distributed that lived only during a short time

Geologic Time Scale

A record of the geologic life forms and events

Era

One of three long periods of time

Period

A part of one of the three different eras

Comet

A ball of ice and dust that orbits the sun

Continental Drift

The slow movement of continents over Earth's surface