Unit 1 Lesson 4: E+D by Wind, Ice, and Gravity

Erosion and Deposition

by Wind, Ice, and Gravity​

How do wind, ice, and gravity change Earth's surface?​

Open Ended

How do you think wind can erode materials?

Open Ended

The dark spots you see in this photo on the right are dirt and rock frozen in the ice.

What do you think will happen to the dirt and rocks when the ice melts?

• When wind moves soil, sand, and rock particles - they act as agents of erosion.

• Abrasion - the wearing down of rock by agents of physical weathering.

• Rocks can become smooth and polished.

​How can the wind shape Earth?

The removal of sediment by wind is called deflation.

​Desert pavement is the result of soil and fine sand being blown away leaving behind small pebbles and rocks.

​Creation of Desert Pavement

Open Ended

How does the desert pavement form?

(USE SCIENCE WORDS)

How can wind shape the Earth?

​Dunes

Dunes are mounds of wind deposited sand that are common along she shores of ocean lakes and in deserts.
Dunes move in the same direction the wind is blowing.
A dunes gently sloped side faces the wind until it reaches the crest, where it will gently fall down the slip face.

​Sand Dunes - Middle East

​Great Sand Dunes National Park - Colorado

Open Ended

Why is the slip face of a dune steeper than the windward slope?

Multiple Choice

In which direction does the wind blow across the photographed dune?

• Left to Right

• Right to Left

Multiple Choice

Which side of the dune in the photograph is the slip face?

• Left Side

• Right Side

• ​Thick deposits of wind-blown, fine-grained, sediment.

• Loess can be found thousands of miles from their original source and build up over thousands or millions of years.

• Forms good soils for growing crops

​

Loess

All materials carried and deposited by a glacier.

​Glacial Drift

A glacier is a large mass of moving ice that forms by the compaction due to natural performances.
Glaciers move downhill due to gravity and drop their loads when they melt.

​Glaciers

Geological Bulldozers

​Glaciers

​Glacial Drift

Open Ended

Where is North America (continent) would you expect to find glaciers?

Match

Match the following

• Sharp, pyramid shaped peaks formed by several aretes.

• Jagged ridges that form between two or more cirques.

• Bowl-shaped depressions where glacial ice cuts back into mountain walls.

• Form when glaciers erode river valleys.

• Small glacial valleys that join the deeper main valley.

Horns

Aretes

Cirques

U-Shaped Valleys

Hanging Valleys

• Horns

• Aretes

• Cirques

• U-Shaped Valleys

• Hanging Valleys

Open Ended

How could a glacier carry large rocks over long distances?

​Kettle Lakes

Open Ended

What does the formation of erratics and kettle lakes have in common?

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Multiple Select

What factors work with gravity to contribute to creep?

• water

• plant roots

• animals

• wind

Multiple Select

What factors can influence the chance of a rapid mass movement?

• rainfall

• human actions

• gradient

• gravity

• birds

Open Ended

List 5 events that can trigger a mass movement...

Multiple Select

What are the three agents of erosion covered in this lesson?

• animal actions

• wind

• water

• ice

• gravity