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The Rock Cycle <ul><li>What are rocks? </li></ul><ul><ul><li>Rocks are made of grains that fit together </li></ul></ul><ul...
Weathering <ul><li>Three types of weathering </li></ul><ul><li>Physical Weathering </li></ul><ul><li>Biological Weathering...
Physical weathering  <ul><li>caused by physical change like temperature or effects from the wind. </li></ul>
Biological weathering  <ul><li>animal and plants can wear away rocks </li></ul>
Chemical weathering  <ul><li>rainwater is naturally acidic because of the carbon dioxide from the air dissolves in it. Min...
Three main types of rocks <ul><li>Sedimentary </li></ul><ul><li>Igneous </li></ul><ul><li>Metamorphic </li></ul>
Sedimentary Rocks <ul><li>Formation  </li></ul><ul><ul><li>river carries or transports, pieces of broken rock as it flows ...
<ul><li>Weight of sediments on the top squash the sediments on the bottom = compaction </li></ul><ul><li>Water is squeezed...
Examples of sedimentary rocks <ul><ul><li>Chalk </li></ul></ul><ul><ul><li>Limestone </li></ul></ul><ul><ul><li>Sandstone ...
Igneous Rocks <ul><li>Inside the earth is very hot – hot enough to melt rocks.  </li></ul><ul><li>Molten rock forms when r...
Examples of Igneous Rocks <ul><li>Basalt </li></ul><ul><li>Granite </li></ul><ul><li>Obsidian </li></ul>
Metamorphic rocks <ul><li>They are formed from other rocks that are changed because of heat or pressure </li></ul><ul><li>...
When metamorphic rocks are formed under pressure, its crystals are arranged in layers
Examples of Metamorphic rocks <ul><li>Slate is formed from shale </li></ul><ul><li>Marble is formed from limestone </li></ul>
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What are rocks ppt

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Transcript of "What are rocks ppt"

  1. 1. The Rock Cycle <ul><li>What are rocks? </li></ul><ul><ul><li>Rocks are made of grains that fit together </li></ul></ul><ul><ul><li>Grains can be different colours, shapes and sizes </li></ul></ul><ul><ul><li>Rocks with rounded grains more likely to absorb water - porous </li></ul></ul>
  2. 2. Weathering <ul><li>Three types of weathering </li></ul><ul><li>Physical Weathering </li></ul><ul><li>Biological Weathering </li></ul><ul><li>Chemical Weathering </li></ul>
  3. 3. Physical weathering <ul><li>caused by physical change like temperature or effects from the wind. </li></ul>
  4. 4. Biological weathering <ul><li>animal and plants can wear away rocks </li></ul>
  5. 5. Chemical weathering <ul><li>rainwater is naturally acidic because of the carbon dioxide from the air dissolves in it. Minerals in rocks may react with rainwater, causing the rocks to be weathered. </li></ul>
  6. 6. Three main types of rocks <ul><li>Sedimentary </li></ul><ul><li>Igneous </li></ul><ul><li>Metamorphic </li></ul>
  7. 7. Sedimentary Rocks <ul><li>Formation </li></ul><ul><ul><li>river carries or transports, pieces of broken rock as it flows along and then settles to the bottom and the rocks are deposited. </li></ul></ul><ul><ul><li>The deposited rocks build up in layers, called sediments = sedimentation. </li></ul></ul>
  8. 8. <ul><li>Weight of sediments on the top squash the sediments on the bottom = compaction </li></ul><ul><li>Water is squeezed out from between the pieces of rock and crystals of different salts form </li></ul><ul><li>The crystals forms a sort of glue that sticks the pieces of rock together = cementation </li></ul>
  9. 9. Examples of sedimentary rocks <ul><ul><li>Chalk </li></ul></ul><ul><ul><li>Limestone </li></ul></ul><ul><ul><li>Sandstone </li></ul></ul><ul><ul><li>shale </li></ul></ul>
  10. 10. Igneous Rocks <ul><li>Inside the earth is very hot – hot enough to melt rocks. </li></ul><ul><li>Molten rock forms when rocks melt = magma </li></ul><ul><li>When the magma cools and solidifies, igneous rocks are formed </li></ul>
  11. 11. Examples of Igneous Rocks <ul><li>Basalt </li></ul><ul><li>Granite </li></ul><ul><li>Obsidian </li></ul>
  12. 12. Metamorphic rocks <ul><li>They are formed from other rocks that are changed because of heat or pressure </li></ul><ul><li>Earth movements can cause rocks to be deeply buried or squeezed. Therefore they are heated and put under pressure </li></ul>
  13. 13. When metamorphic rocks are formed under pressure, its crystals are arranged in layers
  14. 14. Examples of Metamorphic rocks <ul><li>Slate is formed from shale </li></ul><ul><li>Marble is formed from limestone </li></ul>
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