Fossils and Relative Age of Rocks

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10 Terms

1

Fossil

the remains of a once living thing

<p>the remains of a once living thing</p>
2

Sediment

a naturally occurring material that is broken down by processes of weathering and erosion

<p>a naturally occurring material that is broken down by processes of weathering and erosion</p>
3

Petrified

"turned to stone," minerals replace the soft parts of an organism's tissue.

<p>"turned to stone," minerals replace the soft parts of an organism's tissue.</p>
4

Paleontologist

a scientist who studies fossils

<p>a scientist who studies fossils</p>
5

Relative Age

the age of a fossil compared to another fossil

<p>the age of a fossil compared to another fossil</p>
6

Absolute Age

the exact number of years since a fossil was created

<p>the exact number of years since a fossil was created</p>
7

Law of Superposition

the idea that fossils found in lower rock layers are older than fossils found in higher rock layers

<p>the idea that fossils found in lower rock layers are older than fossils found in higher rock layers</p>
8

Intrusion

magma that pushes through rock layers, but never breaks the surface

<p>magma that pushes through rock layers, but never breaks the surface</p>
9

Extrusion

magma that pushes through rock layers and erupts above the surface as lava

<p>magma that pushes through rock layers and erupts above the surface as lava</p>
10

Fault

a crack in the earth's surface

<p>a crack in the earth's surface</p>

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