1 / 24

Weathering

Weathering. DEFINITIONS. WEATHERING. Weathering= the breaking down of rock into smaller and smaller pieces. Is weathering constructive, destructive, or both? Why? -Weathering is destructive- it “tears down” rocks and landforms. 2 Types of Weathering. MECHANICAL WEATHERING. 1. ANIMALS

emmab
Download Presentation

Weathering

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Weathering

  2. DEFINITIONS

  3. WEATHERING • Weathering= the breaking down of rock into smaller and smaller pieces. Is weathering constructive, destructive, or both? Why? -Weathering is destructive- it “tears down” rocks and landforms.

  4. 2 Types of Weathering

  5. MECHANICAL WEATHERING 1. ANIMALS Little animals also help weathering by burrowing and digging through the ground.

  6. 2. Ice Wedging – when water gets into cracks of a rock, freezes & thaws over & over again & splits the rock MECHANICAL WEATHERING

  7. MECHANICAL WEATHERING Ice

  8. MECHANICAL WEATHERING 3. PLANT GROWTH • Roots of plants also push into the rocks and break them apart. They act like wedges and push the rocks apart.

  9. MECHANICAL WEATHERING 4. RELEASE OF PRESSURE- as erosion moves sediment from the surface, pressure is reduced. The outside of the rock begins to flake off

  10. 5. Abrasion-sediments carried by wind, water, or ice wear away rock by hitting & scraping against other rock MECHANICAL WEATHERING NONLIVING CAUSES

  11. Abrasion Wind • sandstone shapes eroded by coastal winds  Sandblasting

  12. WATER - rubs fragments against each other andwears away the surface of the rock by abrasion. The faster the water, the greater the erosion Abrasion

  13. Ice- Glaciers Abrasion • The glacier gouges out chunks of rock and leaves scratches on the rock calledstriations

  14. CHEMICAL WEATHERING the chemical breakdown of rock and minerals into new substances CHEMICAL WEATHERING

  15. Water is considered to be the universal solvent. It dissolves many things – including rock Over time, water can break down even hard rock like granite CHEMICAL WEATHERING

  16. 2) Oxygen Oxidation(rust) is a chemical reaction in which an iron combines with oxygen. CHEMICAL WEATHERING

  17. 3) Carbon Dioxide (CO2) -CO2 mixing with water creates Carbonic Acid that slowly dissolves limestone. (Acid in groundwater) -Caves CHEMICAL WEATHERING

  18. CHEMICAL WEATHERING 4) Living Organisms Acids from decaying plants or fungi such as lichens breaks down rocks

  19. is rain or snow that contains more acids than normal due to air pollution. The acid “dissolves” and “eats away” the rock CHEMICAL WEATHERING 5. ACID PRECIPITATION

  20. WEATHERING

  21. Mechanical Weathering

  22. Chemical Weathering

  23. FORCES THAT CAUSE

  24. Interactive Weathering • How are materials from the earth broken down?

More Related