The earth s surface changes over time due to weathering and erosion
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The Earth’s surface changes over time due to weathering and erosion. - PowerPoint PPT Presentation

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The Earth’s surface changes over time due to weathering and erosion. The Earth’s surface is always changing!. e rosion. Wind Water Ice Gravity.

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e and erosion.rosion





Weathering is part of erosion, and the two terms are often combined. Erosion causes some weathering, but it transports and deposits material while weathering does not.

Weathering and erosion.

The breakdown of the materials of Earth’s crust into smaller pieces.

Weathering causes

soil formation

Water causes weathering
Water causes weathering and erosion.

What evidence of weathering do you see in this picture?

Ice causes weathering
Ice causes weathering and erosion.

Describe how ice causes weathering?

Temperature changes cause weathering
Temperature changes cause weathering. and erosion.

Why did the outer layer of the rock crack?

Erosion and erosion.

The process by which water, ice, wind or gravity moves fragments of weathered rock and soil.

Where did the forces of erosion remove material?

Erosion is movement of sediment
Erosion is Movement of Sediment and erosion.!

  • The process known as Erosion is gradually wearing down the surface of the earth.

  • Erosion moves weathered rock and soil (sediment)  from one place to another.

  • Erosion carves the Earth's surface creating canyons, gorges, and even beaches.

  • Erosion also acts below the surface creating caves.

Which force of erosion carved this feature?Be specific!

Wind erosion
Wind Erosion and erosion.

  • As the wind blows it picks up small particles of sand/sediment and blasts large rocks with the abrasive particles, cutting and shaping the rock.

  • The intensity of wind erosion is determined by:

    • Sum (amount)

    • Speed

    • Slope

    • Surface

Wind erosion1
Wind Erosion and erosion.

Creates sand dunes

Greatest impact

in deserts


fertile topsoil

Water causes erosion
Water Causes Erosion and erosion.

  • runoff, rivers and, streams

Creates MOST of the changes

in the Earth's landscape!

Water causes erosion1
Water causes Erosion and erosion.

When rain falls to the Earth it can evaporate, sink into the ground, or flow over the land as Runoff.

When it flows over land, erosion occurs.

Runoff picks up pieces of rock and "runs" downhill cutting tiny grooves (called rills) into the land.

Rivers and streams are a

constant flow of runoff-

they constantly weather and erode!

Water causes erosion2
Water causes Erosion and erosion.

How much erosion takes place is determined by the:

  • Sum (amount)

  • Slope

  • Speed

  • Surface

Can you act increasing and decreasing the four S’s?

Ice causes erosion
Ice Causes Erosion and erosion.

Glaciers wear down the landscape; by picking up and carrying debris that moves across the land along with the ice.

Ice causes erosion1
Ice Causes Erosion and erosion.

Glaciers can pick up and carry sediment that ranges in size from sand grains to boulders bigger than houses.

Moving like a conveyor belt and a bulldozer, a single glacier can move millions of tons of material!

Ice causes erosion2
Ice Causes Erosion and erosion.

How much erosion takes place is determined by the:

  • **Sum (Glaciers are massive!)

  • Slope

  • Speed

  • Surface

Gravity causes erosion
Gravity causes erosion and erosion.

Creep, Slump, Landslides, Mudslides, and Avalanches.



These are examples of mass movement

(or called mass wasting)

landslide clip.mpeg

Gravity causes erosion1
Gravity causes Erosion and erosion.

How much erosion takes place is determined by the:

  • Sum

  • **Slope

  • Speed

  • **Surface

Deposition and erosion.

Rock particles that are picked up and transported during erosion will ultimately be deposited somewhere else

Deposition is the process by which sediments (small particles of rock) are laid down in new locations.

  • Together, Erosion and Deposition build new landforms.

  • Deltas

  • Canyons

  • Meanders

  • Floodplains

Delta and erosion.

Where rivers meet the ocean is called the mouth of the river. Soil and dirt carried by these rivers is deposited at the mouth, and new land is formed. The new, soil-rich land is known as a Delta

Canyons and erosion.

This simple animation provides you with a visualization of how the Colorado River has "downcut" into the rock layers of the Grand Canyon.

How long it took to carve the Grand Canyon is debated bygeologists.

Some estimates are between 6 and 8million years, which is very recent by comparison.

Canyons are large valleys created by a river or stream.

Meanders and erosion.

Meandering streams wander side to side as they constantly seek out the lowest elevation.

This constant motion creates a series of S-shaped “loops”.

Meanders and erosion.

Stream Velocity varies from one side to the other side of the “S”, resulting in erosion in some places and deposition of sediments in others.

Floodplains and erosion.

  • Floodplains form along the banks of mid-order streams and larger rivers.

  • These are low-lying areas along the sides of a river channel that have regular times of heavy waterflow to cause the river to spill over and flood the land.