L4: Erosion and Deposition by Wind, Ice, and Gravity

L4: Erosion and Deposition by Wind, Ice, and Gravity

By Ammara Shahzad

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How can wind shape Earth?

•When wind moves soil, sand, and rock particles, it acts as an agent of erosion.

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•The removal of fine sediment by wind is called deflation.

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Subject | Subject

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How can wind shape Earth?

Wind can shape the Earth in following ways:

1. desert pavement

2. dunes

3. loess

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How can wind shape Earth?

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•Desert pavement results when wind carries soil and fine sediment away from an area, leaving only pebbles and small rocks behind.​

Multiple Choice

•How does desert pavement form? رصيف الصحراء

Q5 page no 46

• when the wind carries soil and fine sediment away, leaving only pebbles and small rocks behind

• when the water carries soil and fine sediment away, leaving only pebbles and small rocks behind

•Dunes are mounds (تلال)  of wind-deposited sand, common in deserts and along the shores of lakes and oceans.

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•Dunes usually move in the same direction the wind is blowing.

Multiple Choice

•The removal of fine sediment by wind is called deflation.

• true

• false

Open Ended

Why do you think loess can be carried further

than sand?

page no 47 Question # 6

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•Loess consists of thick deposits of windblown, fine-grained sediment.

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•Loess forms good soils for growing crops.

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•A glacier is a large mass of moving ice that forms by the compacting of snow by natural forces.

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•Glaciers move downhill by gravity and cause erosion.

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•Glacial drift is the general term for all materials carried and deposited by a glacier.

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Multiple Choice

identify

• glacier

• desert

• forest

•An alpine glacier is a glacier that forms in a mountainous area.

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•Continental glaciers are thick sheets of ice that may spread over large areas, including across entire continents.

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Multiple Choice

identify Alpine galaciers

Gravity can  shape Earth by moving material downslope in several ways.

1. Slow Mass Movement

a. Creep

2. Rapid Mass Movement

a.Rockfall

b.Landslide

c.Mudflow

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extremely slow movement of material downslope.

Rockfall: when loose rocks fall down a steep slope

A landslide is the sudden and rapid movement of a large amount of material downslope.

​Mudflow is a rapid movement of a large mass of mud

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Multiple Choice

The soil creep is the extremely slow movement of material downslope.

• True

• False

• no idea

Multiple Choice

Identify landlslide

Multiple Choice

mudflow is

• rapid movement of a large mass of mud

• rapid movement of a large mass of water

• rapid movement of a large mass of rock

Open Ended

How Gravity can  shape Earth?

Open Ended

How was your today's lesson?

Open Ended

What did you learn from today's lesson?