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Exam 11: Running Water

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Question 1

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Briefly explain what will happen to a stream's behavior if one drains a lake that is a temporary base level for that stream.

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Drainage of a lake that serves as a temp...

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Question 2

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Describe where flow velocity is highest in a semi-straight channel and why?

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Flow velocity is highest in the center o...

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What is meant by the term "divide" as in the continental divide along the Rocky Mountains?

Braided streams have an intricate network of dividing and rejoining channels.

What happens when a stream overflows its banks?

Particles move along a streambed by:

The types of marine deltas that are recognized, based on the relative importance of the processes involved in their formation, are ____________________-dominated, ____________________-dominated, and ____________________-dominated.

A fan-shaped deposit of alluvium that forms adjacent to highlands in arid or semiarid climates is called a(n) ____________________.

An uplifted erosional remnant of a floodplain that formed when a stream was flowing at a higher level is called a(n) ___________________

Deep, meandering canyons cut into bedrock are called:

Streams with broad, shallow channels and narrow, deep channels have a higher flow velocity than do those with semi-circular channels.

The percentage of the Earth's water that is fresh water that is not frozen is:

How often will a flood of a 50-year magnitude occur?

What is stream piracy? What happens when one stream pirates another?

In the hydrologic cycle, what happens to the precipitation that falls on the land?

A delta that has islands reworked by waves on the seaward side, such as the Nile delta, is typically formed as in a(n) ____-dominated delta.

Meandering streams have semi-circular cross-sections along most of their length.

Briefly explain the physical properties of water instrumental in the hydrologic cycle.

What is a 20-year flood?

When infiltration capacity is exceeded and water begins to move rapidly downslope, a continuous film of water known as ____________________ flow develops. This type of flow can result in ____________________.