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13 Cards in this Set

  • Front
  • Back

Relative Age

The age of a rock compared to the ages of rock layers

Absolute Age

The age of rock given as the number of years since the rock formed

Law of Superposition

The geologic principle that states that in horizontal rock layers, each layer is older than the layer above it and younger than the layer below it.

Extrusion

Lava that hardens on the surface


Intrusion

Magma that forces its way into rock and hardens

Fault

A break in earths crust

Uncomformity

A place where a old, eroded rock surface is in contact with a newer rock layer

Index Fossil

Fossils of widely distributed organisms that lived for a short period

Geologic Time Scale

A record of geologic events and life forms in earths history

Era

One of the three long units of geologic time between the precamprian and the present

Period

One of the units geologic time into in which are divided into eras

Comet

A ball of dust and ice that orbits the sun

Continental Drift

The slow movement of continents over earths surface