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C1 Review. Ms. Leung. Changing of the Earth’s surface by breaking it down. 2 processes- WEATHERING- the breaking down of the materials of Earth’s crust into smaller pieces. EROSION- the picking up and carrying away the pieces. 2 types of weathering. Physical Weathering Chemical Weathering.

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C1 Review

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C1 review

C1 Review

Ms. Leung


Changing of the earth s surface by breaking it down

Changing of the Earth’s surface by breaking it down

  • 2 processes-

  • WEATHERING- the breaking down of the materials of Earth’s crust into smaller pieces.

  • EROSION- the picking up and carrying away the pieces.


2 types of weathering

2 types of weathering

  • Physical Weathering

  • Chemical Weathering


Physical weathering water

Physical Weathering- WATER

  • Weathering happens when the crust is exposed to water, air, and changes in temperature.

  • Water

    - water can dissolve minerals right out of the crust.

    - Moving water can make pieces of rock bang into each other.

    - Small chips can break off the surface of the rock- this causes the rock to get smaller and rounder.

    - The churning (harsh movement) of water streams can wear down big pieces of rock into small round pebbles.


Physical weathering wind

Physical weathering- Wind

  • Wind (moving air)

  • Blows sand and other broken bits of rock over the Earth’s surface (This can also wear away rock)


Physical weathering temperature

Physical weathering- Temperature

  • Temperature drops low enough for water to freeze- when the water freezes is expands- gets bigger- take up more spaces. When water freezing in cracks of rocks the force of the expanding water is great enough to split the rock apart.

  • Change in temperature can also cause a rock to expand and contract. (only certain types of rocks) This will eventually cause the rock to break down.


Chemical weathering

Chemical Weathering

  • Air contains gases that react chemically to form new substances.-Oxygen in the air reacts with iron to form rust

    - Carbon Dioxide and Sulfur Dioxide in the air react with rain to form acids (eat away limestone rock)


Erosion

Erosion

  • Carrying away of pieces of weather rock by gravity

  • Think about it over enough time, erosion can carry away a boulder, a hill, or even a mountain.

  • The most important factor of erosion is WATER.


The most important factor of erosion is water

The most important factor of erosion is WATER.

  • From the moment a drop of water hits the ground, it erodes the land.

  • Once water reaches the ground, it will begin to move downhill.

    • The water moving down hill will pick up things and carry them along in its journey.

    • The faster the water is moving, the bigger the piece of rocks it can move.


Wind and ice erosion

Wind and ICE Erosion

  • Wind- picks up small particles and moves them

  • ICE- freezes onto the rock and scrapes away the surfaces. Ice can also tear rocks from the ground as it moves.


Let s think about what happens to moving water

Let’s think about what happens to moving water

  • It is eventually going to slow down when it flows into a large body of water (OCEAN or lake)

  • When the water stops moving it also stops carrying the eroded material- these pieces are just dropped. The dropped pieces of eroded material is called deposition.

  • Deposition-The dropping off of bits of eroded rock.


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