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Weathering

Weathering. Weathering. Weathering The process of breaking down rock by other substances at Earth’s surface Erosion The carrying weathered rock from one location to another Mechanical Weathering Rock is physically broken down Smaller pieces have same composition Chemical Weathering

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Weathering

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  1. Weathering

  2. Weathering • Weathering • The process of breaking down rock by other substances at Earth’s surface • Erosion • The carrying weathered rock from one location to another • Mechanical Weathering • Rock is physically broken down • Smaller pieces have same composition • Chemical Weathering • Rock is chemically broken down • Smaller pieces have different composition

  3. Mechanical Weathering types • Release of Pressure • Topsoil is removed • Rock allowed to expand and flake off

  4. Mechanical Weathering types • Freezing and Thawing • Water enters crack in rock • Water freezes and expands crack in rock

  5. Mechanical Weathering types • Plant Growth • Plant roots grow in cracks of rock • As roots grow and expand cracks are widened

  6. Mechanical Weathering types • Animal Action • Animals (moles, groundhogs, and some insects) dig into ground • Soil is then loosened

  7. Mechanical Weathering types • Abrasion • Sand and other rock particles are carried by water, wind, and ice • Rock is then worn away like sand blasting

  8. Chemical Weathering • Chemical Weathering • Rock is chemically broken down • Smaller pieces have different composition • Factors for rate of Chemical Weathering • Climate • Type of rock • Amount of surface area

  9. Chemical Weathering types • Water • Most important cause • Dissolves rock • Material (Rock) mixes uniformly in water to make a solution

  10. Chemical Weathering types • Oxygen • Oxidation: Oxygen mixes with metal (Iron) • Product is rust • Rock that has iron in it oxidizes or rust • Rust causes rock to become soft and crumble

  11. Chemical Weathering types • Carbon Dioxide • Atmospheric gas • Mixes with rainwater and groundwater • Water seeps into cracks and pours of rocks • Easily weathers limestone and marble

  12. Chemical Weathering types • Living Organisms • Plants that grow on or in rocks produce a weak acid that chemically break down rock • Example: Lichens and mosses

  13. Chemical Weathering types • Acid Rain • Burning fossil fuels (oil, coal, and gasoline) • Byproduct produces gases (sulfur, carbon, and nitrogen) compounds produced • Compounds combine with water vapor in clouds forming acids (carbonic acid) • Raindrops fall as acid rain causing rapid chemical weathering

  14. Chemical WeatheringAcid Rain

  15. Chemical WeatheringAcid Rain

  16. Chemical WeatheringAcid Rain

  17. Sugar Cube Lab • How does weathering affect rock? • Independent variable: • Dependent variable: • Things that remain constant: • Prediction • Materials

  18. Sugar Cube Lab • Procedure • Place one sugar cube in each cup • Crush one of the sugar cubes • Measure out ______ml of water in each graduated cylinder • Place water in cup with sugar • Time how long sugar takes to dissolve in solution while stirring.

  19. Sugar Cube Lab • Data Table: • Graph: • Conclusion: • What happen to the sugar cubes (use numbers to support) • Why did this happen • What does the crushed sugar cube represent • Was there a possibility for any errors

  20. Sugar Cube Lab • Written response paragraph • How does surface area affect the rate the rock is weathered

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