Water Erosion 2

Water Erosion 2

By NORMA NAVAS

Multiple Choice

A ………………………………. is the area of land drained by a river system ( a river and its tributaries).

• Watershed

• drainage basin

• confluence

• water table

• or young river, is a river in an early stage of development.

• cuts a valley with steep sides into the Earth’s surface,typically V-shaped,

Immature river

Life Cycle of a River

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Life Cycle of a RIver

Mature River

• has been developing for many thou

  sands of years

• ​The course of the river has also become

  curved and winding, forming loops called rnciers

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Open Ended

What is one way you can tell the difference between an immature and a mature river?

Sometimes the meanders of a river form large, U-shaped bends. Erosion along such bends can cut these bends off from the rivet. Deposited sediments dam up the ends of the meander. A small lake called an oxbow lake is formed.

​Oxbow lakes

Deposits by Rivers

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When a river leaves the mountains and runs out onto a plain, its speed decreases.

Nearly all the sediments the river is carrying are dropped.

​ALLUVIAL FANS

Deposits by Rivers

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Multiple Choice

Alluvial fan forms when the deposits are left in front of the sea.

• True

• False

Multiple Choice

U-shaped lake formed when erosion and deposition cut off a meander of a river is:

• Meander

• Oxbow

• Delta

• Alluvial fan

Large amounts of sediments deposited

at the mouth of a large river that flows into a lake or an ocean

DELTAS

Deposits by Rivers

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On both sides of a mature river or stream, flat areas called flood plains form.After heavy rains or spring thaws, the river overflows its banks and covers the flood plain. Sediments are deposited on the plain. Repeated flooding causes sediments to build up. Flood plains have fertile soil.

FLOOD PLAINS

Deposits by Rivers

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Multiple Choice

Where are deltas located?

• At the mouth of a river

• At the start of a river

• on a beach

• At the top of a mountain

Multiple Choice

Rich, fertile soil deposited on the sides of

a river as it overflows forms flat areas

called

• terraces

• sand bars

• flood plains

• leeve

Multiple Choice

Which of the following is NOT needed to form a delta?

• water

• sediments

• ocean

• ice