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Destructive Forces

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Destructive Forces

  1. 1. Destructive Forces Kristen Eubanks Lake Carolina Elementary
  2. 2. Weathering <ul><li>A physical or chemical process that breaks down rocks near the Earth’s surface. </li></ul><ul><li>Causes of weathering: </li></ul><ul><ul><li>Plants </li></ul></ul><ul><ul><li>Water </li></ul></ul><ul><ul><li>Ice </li></ul></ul><ul><ul><li>Changes in Temperature </li></ul></ul><ul><ul><li>Anything that causes rocks to wear or break down </li></ul></ul>
  3. 3. Weathering http://www.uky.edu/AS/Geology/howell/goodies/elearning/module07swf.swf
  4. 4. Erosion <ul><li>Movement of sediments by soil, wind, water or gravity. </li></ul>http://science.nationalgeographic.com/science/photos/weathering-erosion-gallery.html
  5. 5. Landslides <ul><li>The mass movements of land due to gravity. </li></ul><ul><li>Can cause: </li></ul><ul><ul><li>Buildings to fall </li></ul></ul><ul><ul><li>Power lines and gas tanks to break </li></ul></ul><ul><li>Can occur on the continental slope of the ocean. </li></ul>
  6. 6. Landslides http://www.unoriginal.co.uk/footage10_3.html
  7. 7. Volcanic Eruptions <ul><li>Mountains with openings in the Earth’s crust through which magma, gases, and ash reach the earth’s surface. </li></ul><ul><li>Eruptions can: </li></ul><ul><ul><li>Change the Earth’s surface on top of a mountain. </li></ul></ul><ul><ul><li>Destroy fields and forests with lava and ash. </li></ul></ul><ul><ul><li>Change Earth’s weather patterns. </li></ul></ul><ul><ul><li>Occur under oceans (called Seamounts) </li></ul></ul>
  8. 8. Volcanic Eruptions http://www.volcanovideo.com/p8vidclp.htm
  9. 9. Earthquakes <ul><li>Vibrations on the Earth’s surface caused by a sudden movement in Earth, often along a fault or break in the Earth’s surface. </li></ul><ul><li>Some cause little damage while others cause a lot of damage. </li></ul><ul><li>Large quakes can cause landslides. </li></ul><ul><li>Earthquakes under the ocean can cause huge waves, tsunamis, that destroy land and cause great damage when they come ashore. </li></ul>
  10. 10. Earthquakes http://video.google.com/videosearch?hl=en&q=earthquake&um=1&ie=UTF-8&sa=X&oi=video_result_group&resnum=5&ct=title# http://earthquake.usgs.gov/
  11. 11. Floods <ul><li>A large amount of water covers land that’s normally dry. </li></ul><ul><li>Flooding causes rapid erosion and the soil and sediments to move away. </li></ul><ul><li>When flooding goes away, a new sediment is left behind and can build up rich soil deposits. </li></ul>
  12. 12. Floods http://www.ultimatechase.com/Flooding_Video.htm