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Base level

the deepest point that a river can erode.


part of the Earth's crust

Bench Mark

point of known elevation

Bing Bang

how the universe began


sedimentary rocks formed from living organisms


attachment of atoms or molecules


(joule) unit of heat energy


the ability of water to creep upward.


radioactive element organic remains less than 50,000 years.

Celestial objects

things outside the Earth's atmosphere

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