Rocks and landscapes de sergio gutierrez fernandez

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Rocks and landscapes de sergio gutierrez fernandez

  1. 1. Types of Rocks -Igneous rocks: From volcanic activity. -Sedimentary rocks: Either of small particles of other rocks that have been eroded and transported or of the remains of plants and animals. -Metamorphic rocks: Altered by extremes of heat and/or pressure.
  2. 2. -Weathering includes the breaking up and decay of rocks in places where they formed.
  3. 3. Physical Weathering
  4. 4. -It is when water and air activate chemical changes that cause rock to rot and decay. Chemical reactions are greatest where the climate is very warm and wet.
  5. 5. The Structure of a Rock can affect -Its resistance to erosion and its permeability to water.
  6. 6. -The harder the rock, the more resistant it is likely to be to erosion. Hills and mountains tend to form in areas of harder rock while valleys are found on softer rock. Permeability -Impermeable rock has numerous surface rivers and may be badly drained, in contrast to permeable rock which has few surface rivers; groundwater instead.
  7. 7. What do chalk areas look like? -Chalk, which is a soft limestone, occurs in southeast England. It is permeable and so, as it is relatively resistant to erosion, it can form: *Low-lying, gently rounded hills *Ridges (escarpments)
  8. 8. Why Carboniferous limestone produces distinctive landforms? -Chemical weathering -Rock structure -Permeability When a river reaches limestone? -It begins to dissolve joints and bedding planes.
  9. 9. Underground Caves. -Sometimes solution is so active that form underground caves.
  10. 10. -The river flow over the impermeable rock until it reaches the surface. The place where it reappears is called resurgence.
  11. 11. The End

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