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Erosion and Deposition Erosion and Depostition - Changing Earth’s Surface - Changing Earth’s Surface -

Changing Earth’s Surface - Weber School Districtblog.wsd.net/cnielsen/files/2013/02/ErosionAndDeposition.pdf · Water erosion: - Changing Earth’s Surface. ... As you read, compare

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Erosion and Deposition

Erosion and

Depostition - Changing Earth’s Surface

- Changing Earth’s Surface -

Erosion and Deposition

Changing Earth’s Surface—

Shaping the land A. Weathering The breaking down of solid

rock into smaller particles.

B. Erosion: The movement of the products

of weathering form where they were formed to a

different location.

C. Deposition: The accumulation of eroded

sediments.

- Changing Earth’s Surface

Erosion and Deposition

Wearing Down and Building Up

Weathering, erosion, and deposition act together in a cycle

that wears down and builds up Earth’s surface.

- Changing Earth’s Surface

Erosion and Deposition

Agents of erosion.

1. Gravity:

2. Glaciers

3. Wind Erosion

4. Water erosion:

- Changing Earth’s Surface

Erosion and Deposition

Gravity Erosion

--Mass Movement

The different types of

mass movement

include landslides,

mudflows, slump, and

creep.

- Changing Earth’s Surface

Erosion and Deposition

Mass Movement Activity

- Changing Earth’s Surface

Website: phschool.com

Webcode: cfp-2031

Erosion and Deposition

Type of Mass

Movement Speed Slope

Comparing and Contrasting

As you read, compare and contrast the different types of

mass movement by completing a table like the one below.

Landslide rapid steep

Mudflow rapid gentle to steep

Slump rapid steep

Creep slow gentle to steep

Mass Movement

- Changing Earth’s Surface

Erosion and Deposition

Water Erosion Precipitation over the United States averages about 75 cm

per year. About 22.5 cm becomes runoff. Generally, more

runoff means more erosion.

Erosion and Deposition

Water Erosion

Water flowing across the land runs together to form rills,

gullies, and streams.

- Water Erosion

Erosion and Deposition

Erosion by Rivers

A waterfall forms where a flat layer of tough rock lies over a

layer of softer rock that erodes easily. When the softer rock

erodes, pieces of the harder rock above break off, creating

the waterfall’s sharp drop.

- Water Erosion

Erosion and Deposition

Erosion and Sediment Load

A river erodes sediment from its banks on the outside curve

and deposits sediment on the inside curve.

- The Force of Moving Water

Erosion and Deposition

Erosion by Rivers

Erosion often forms meanders and oxbow lakes where a

river winds across its floodplain.

- Water Erosion

Erosion and Deposition - Water Erosion

The Course of a River

The slope and size of a

river, as well as the

sediment it carries,

determine how a river

shapes the land.

Erosion and Deposition

Deposits by Rivers

Deposition creates landforms such as alluvial fans and

deltas.

- Water Erosion

Erosion and Deposition - Water Erosion

Groundwater Erosion

Chemical weathering of limestone and groundwater erosion

can create a limestone cave.

Erosion and Deposition

How Water Erodes

Most sediment washes or falls into a river as a result of mass

movement and runoff. Other sediment erodes from the

bottom or sides of the river. Streams carry sediment in

several ways, as shown in the diagram.

- The Force of Moving Water

Erosion and Deposition

Water Erosion and Sediment Load

A river’s slope is usually greatest near the river’s source. As

a river approaches its mouth, its slope lessens.

- The Force of Moving Water

Erosion and Deposition

Sediment on the Move

The speed, or velocity, of a

stream affects the size of the

sediment particles the stream

can carry.

- The Force of Moving Water

Erosion and Deposition

Erosion by Waves

Waves shape the coast through erosion by breaking down

rock and transporting sand and other sediment.

- Waves

Erosion and Deposition

Erosion by Waves

Erosion and deposition create a variety of features along a

coast.

- Waves

Erosion and Deposition

Deposits by Waves

Waves shape a coast when they deposit sediment, forming

coastal features such as beaches, spits, and barrier

beaches.

- Waves

Erosion and Deposition

Glacier Erosion

A continental glacier is a glacier that covers much of a

continent or large island.

Erosion and Deposition

Glacier Erosion:

How Glaciers Form and Move During the last ice age, a continental glacier covered most of

northern North America.

Erosion and Deposition

How Glaciers Shape the Land

As a glacier moves, plucking breaks pieces of bedrock from

the ground.

- Glaciers

Erosion and Deposition

How Glaciers Shape the Land

Erosion by glaciers can carve a mountain peak into a sharp

horn and grind out a V-shaped valley to form a U-shaped

valley.

- Glaciers

Erosion and Deposition

How Glaciers Shape the Land

As glaciers advance and retreat, they sculpt the landscape

by erosion and deposition.

- Glaciers

Erosion and Deposition

How Wind Causes Erosion

Wind erosion moves sediment particles of different sizes in

the three ways shown below.

- Wind

Erosion and Deposition

Wind Deposition

Wind erosion and deposition may form sand dunes and loess

deposits.

- Wind