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Forces That Shape Our        Earth:     Weathering         And       Erosion
Weathering & Erosion:   Erosion and weathering are major    forces that shape Earth’s surface.   For example, the Grand ...
What is weathering?Weathering: The breaking down of rocks into smaller pieces.1. Mechanical /Physical2. Chemical          ...
So what is erosion?Erosion: The movement of weathered rock by wind, water, glaciers & gravity
Types of Weathering:Mechanical/Physical: Rock is physically broken into smaller pieces (larger pieces become smaller piece...
5 Agents of Mechanical           Weathering:1.   Release of Pressure2.   Freezing & Thawing3.   Animal Actions4.   Plant G...
Release of Pressure As the surface of a rock is  eroded, the rock begins to release  pressure Causes top layers of the r...
Release of pressure: rock cracks like an egg shell
Freezing & ThawingWhen water in the cracks of rocks freezes it expands causing the crack to enlarge or get bigger. The ice...
Result of Freezing & Thawing
Animal ActionsAnimals dig (burrow) through the ground to make their homes. This loosens the soil & breaks apart rocks.
Plant Root GrowthPlants roots can grow into cracks in the rock, slowly breaking them apart.
Abrasion   Sand and other rock particles in    wind, water or ice can wear    away exposed rock surfaces.   Like sandbla...
Chemical WeatheringThe process that breaks down the surface of rock by chemical changes.
5 Agents of Chemical             Weathering1.   Water2.   Oxygen3.   Carbon Dioxide4.   Living Organisms5.   Acid Rain
WaterWater dissolves rockWater is the most important cause of chemical weathering
Oxygen Oxygen + Water + Iron = Rust through the Chemical reaction called Oxidation Rock will become crumbly, soft, and a...
Rusted rock on hillside
Carbon DioxideCO2 + rainwater = Carbonic AcidCarbonic Acid weathers softer rock like limestone & marble as it seeps into s...
Living OrganismsThe roots of plants make a weak acid that slowly dissolves rocks around the plant.
Lichens grow on rock
Acid RainAcid rain causes rocks to weather very rapidly.
Forces that shape our earth
Forces that shape our earth
Forces that shape our earth
Forces that shape our earth
Forces that shape our earth
Forces that shape our earth
Forces that shape our earth
Forces that shape our earth
Forces that shape our earth
Forces that shape our earth
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Forces that shape our earth

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Forces that shape our earth

  1. 1. Forces That Shape Our Earth: Weathering And Erosion
  2. 2. Weathering & Erosion: Erosion and weathering are major forces that shape Earth’s surface. For example, the Grand Canyon was formed through erosion by the Colorado River running through it!
  3. 3. What is weathering?Weathering: The breaking down of rocks into smaller pieces.1. Mechanical /Physical2. Chemical Hulk Rock Smash!
  4. 4. So what is erosion?Erosion: The movement of weathered rock by wind, water, glaciers & gravity
  5. 5. Types of Weathering:Mechanical/Physical: Rock is physically broken into smaller pieces (larger pieces become smaller pieces of the same rock)Chemical: Rock is chemically changed (like rusting or dissolving away)
  6. 6. 5 Agents of Mechanical Weathering:1. Release of Pressure2. Freezing & Thawing3. Animal Actions4. Plant Growth5. Abrasion
  7. 7. Release of Pressure As the surface of a rock is eroded, the rock begins to release pressure Causes top layers of the rock to crack and flake off
  8. 8. Release of pressure: rock cracks like an egg shell
  9. 9. Freezing & ThawingWhen water in the cracks of rocks freezes it expands causing the crack to enlarge or get bigger. The ice melts & refreezes over & over, breaking the rock apart.
  10. 10. Result of Freezing & Thawing
  11. 11. Animal ActionsAnimals dig (burrow) through the ground to make their homes. This loosens the soil & breaks apart rocks.
  12. 12. Plant Root GrowthPlants roots can grow into cracks in the rock, slowly breaking them apart.
  13. 13. Abrasion Sand and other rock particles in wind, water or ice can wear away exposed rock surfaces. Like sandblasting or sandpaper on wood
  14. 14. Chemical WeatheringThe process that breaks down the surface of rock by chemical changes.
  15. 15. 5 Agents of Chemical Weathering1. Water2. Oxygen3. Carbon Dioxide4. Living Organisms5. Acid Rain
  16. 16. WaterWater dissolves rockWater is the most important cause of chemical weathering
  17. 17. Oxygen Oxygen + Water + Iron = Rust through the Chemical reaction called Oxidation Rock will become crumbly, soft, and appear reddish-brown in color
  18. 18. Rusted rock on hillside
  19. 19. Carbon DioxideCO2 + rainwater = Carbonic AcidCarbonic Acid weathers softer rock like limestone & marble as it seeps into spaces in rock.Ex: sinkholes, caves
  20. 20. Living OrganismsThe roots of plants make a weak acid that slowly dissolves rocks around the plant.
  21. 21. Lichens grow on rock
  22. 22. Acid RainAcid rain causes rocks to weather very rapidly.

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