Earth Science

 

 

Runoff

 

Water flowing downslope along the Earth’s surface

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Watershed

 

All of the land area whose water drains into a stream system. 

 

 

 

Divide

 

A high land area that separates one watershed from another.   

 

Suspension

 

Method of transport for all particles small enough to be held up by moving water. 

 

Bed load

 

Sand, pebbles, and cobbles that a stream’s water can roll or push along the bed of the stream 

 

Discharge

 

Measure of the volume of stream water that flows past a particular location. 

 

Flood

 

Water spills over the sides of a stream’s banks 

 

Floodplain

 

Broad, flat area that extends out from a stream’s bank and is covered by excess water during flood times. 

 

Stream channel

 

Moving water carves a narrow pathway into the sediment or rock 

 

Stream banks

 

Hold moving water within them. 

 

Base level

 

Elevation at which a stream enters another body of water 

 

Meander

 

Bend or curve in a stream channel caused by moving water. 

 

Delta

 

Triangular deposit that forms where a stream enters a large body of water 

 

Rejuvenation

 

Stream resumes the process of downcutting toward its base level. 

 

Lake

 

Bodies of water surrounded by land. 

 

Eutrophication

 

Process by which the land enriches bodies of water and causes excessive plant growth. 

 

Wetland

 

Any land area covered by water for part of the year. 

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