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17.4 Weathering and ErosionTo do:• Class reading: page 583 – 588.•    Individual Silent Work: Vocabulary starting page 583
17.4 Weathering and ErosionWeathering – The change in the physical form orchemical composition 0f rock materials exposed a...
17.4 Weathering and ErosionTwo types of the Weathering process:  1. Physical or mechanical – it is a kind of      weatheri...
17.4 Weathering and Erosion  a. Ice (frost wedging) – occurs when water seeps     into cracks or joints in rocks and then ...
17.4 Weathering and Erosion   b. Plants (plant wedging) – occurs when roots      grow into cracks in the rocks. As the pla...
17.4 Weathering and Erosion2. Chemical Weathering- kind of weathering that   breaks down rocks by changing its chemical   ...
17.4 Weathering and Erosion  a. Oxidation – When certain elements, specially     metals, react with oxygen, they become   ...
17.4 Weathering and Erosion  b. Carbon dioxide – carbon dioxide in the air     dissolves in rainwater resulting to a carbo...
17.4 Weathering and Erosion    - Although carbonic acid is a weak acid, it      reacts with minerals, seeps into the groun...
17.4 Weathering and Erosion        - Acid rain damages both living organisms           and non-living matter.How does poll...
17.4 Weathering and ErosionHow does pollution contribute to acid rain?- Coal, oil and gasoline – release gases including  ...
17.4 Weathering and Erosion - US Act of 1970 (Clean Air Act) – reduced the release   of chemicals that cause acid rains. A...
17.4 Weathering and ErosionErosion – removal and transportation of weathered   and non-weathered materials by agents of er...
17.4 Weathering and Erosion   •   Ice   •   underground water   •   gravity.Notes on Erosion:  • Water erosion shapes Eart...
17.4 Weathering and ErosionNotes on Erosion:  • Water erosion shapes Earth’s surface  • Water is by far the most effective...
17.4 Weathering and ErosionNotes on Erosion:  • Rivers carry sediments that scrapes and scratch      rocks and soil in riv...
17.4 Weathering and Erosion Poster: figure 17-35 on page 588
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2.3c weathering and erosion

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Transcript of "2.3c weathering and erosion"

  1. 1. 17.4 Weathering and ErosionTo do:• Class reading: page 583 – 588.• Individual Silent Work: Vocabulary starting page 583
  2. 2. 17.4 Weathering and ErosionWeathering – The change in the physical form orchemical composition 0f rock materials exposed atEarth’s surface.Two types of the Weathering process: 1. Physical or mechanical – it is a kind of weathering that breaks rocks into smaller pieces but does not alter the rocks’ chemical composition.
  3. 3. 17.4 Weathering and ErosionTwo types of the Weathering process: 1. Physical or mechanical – it is a kind of weathering that breaks rocks into smaller pieces but does not alter the rocks’ chemical composition. a. Ice (frost wedging) – occurs when water seeps into cracks or joints in rocks and then freezes. When water freezes, its volume increase by about 10% pushing the rock apart.
  4. 4. 17.4 Weathering and Erosion a. Ice (frost wedging) – occurs when water seeps into cracks or joints in rocks and then freezes. When water freezes, its volume increase by about 10% pushing the rock apart. b. Plants (plant wedging) – occurs when roots grow into cracks in the rocks. As the plant grows, the roots exert a constant pressure on the rock. The crack continues to deepen and widen, eventually causing a piece of the rock to break off.
  5. 5. 17.4 Weathering and Erosion b. Plants (plant wedging) – occurs when roots grow into cracks in the rocks. As the plant grows, the roots exert a constant pressure on the rock. The crack continues to deepen and widen, eventually causing a piece of the rock to break off.2. Chemical Weathering- kind of weathering that breaks down rocks by changing its chemical composition.
  6. 6. 17.4 Weathering and Erosion2. Chemical Weathering- kind of weathering that breaks down rocks by changing its chemical composition. a. Oxidation – When certain elements, specially metals, react with oxygen, they become oxides and their properties change.
  7. 7. 17.4 Weathering and Erosion a. Oxidation – When certain elements, specially metals, react with oxygen, they become oxides and their properties change. - Oxidation in minerals causes minerals to decompose or form new minerals causing both chemical and physical appearance of the rock to change. b. Carbon dioxide – carbon dioxide in the air dissolves in rainwater resulting to a carbonic acid.
  8. 8. 17.4 Weathering and Erosion b. Carbon dioxide – carbon dioxide in the air dissolves in rainwater resulting to a carbonic acid. - Although carbonic acid is a weak acid, it reacts with minerals, seeps into the ground and weather rocks underground. - Acid rain – slowly dissolves minerals caused burning fossil fuels in cars, power stations, factories
  9. 9. 17.4 Weathering and Erosion - Although carbonic acid is a weak acid, it reacts with minerals, seeps into the ground and weather rocks underground. - Acid rain – slowly dissolves minerals caused burning fossil fuels in cars, power stations, factories. - Acid rain damages both living organisms and non-living matter.
  10. 10. 17.4 Weathering and Erosion - Acid rain damages both living organisms and non-living matter.How does pollution contribute to acid rain?- Coal, oil and gasoline – release gases including sulfur dioxide reacting with water in the air and clouds to form nitric acid or nitrous acid and sulfuric acid.
  11. 11. 17.4 Weathering and ErosionHow does pollution contribute to acid rain?- Coal, oil and gasoline – release gases including sulfur dioxide reacting with water in the air and clouds to form nitric acid or nitrous acid and sulfuric acid. - US Act of 1970 (Clean Air Act) – reduced the release of chemicals that cause acid rains. Acidity of rain is greatly reduced.
  12. 12. 17.4 Weathering and Erosion - US Act of 1970 (Clean Air Act) – reduced the release of chemicals that cause acid rains. Acidity of rain is greatly reduced.Erosion – removal and transportation of weathered and non-weathered materials by agents of erosion. Agents of Erosion: • running water • Wind
  13. 13. 17.4 Weathering and ErosionErosion – removal and transportation of weathered and non-weathered materials by agents of erosion. Agents of Erosion: • running water • Wind • Waves • Ice • underground water • gravity.
  14. 14. 17.4 Weathering and Erosion • Ice • underground water • gravity.Notes on Erosion: • Water erosion shapes Earth’s surface • Water is by far the most effective physical weathering agent.
  15. 15. 17.4 Weathering and ErosionNotes on Erosion: • Water erosion shapes Earth’s surface • Water is by far the most effective physical weathering agent. • Rivers carry sediments that scrapes and scratch rocks and soil in riverbanks and river bottom • Deposition – the process of depositing sediments on the floor of calmer portions of rivers, lakes and sea.
  16. 16. 17.4 Weathering and ErosionNotes on Erosion: • Rivers carry sediments that scrapes and scratch rocks and soil in riverbanks and river bottom • Deposition – the process of depositing sediments on the floor of calmer portions of rivers, lakes and sea. • Glaciers erode mountains • Wind also shape landscapes
  17. 17. 17.4 Weathering and Erosion Poster: figure 17-35 on page 588
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