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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

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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