The geological cycle

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The geological cycle

  1. 1. The Geological Cycle Antonio Martín
  2. 2. Wearing Down Earth’s Surface “Destructive forces, such as weathering and erosion, wear down Earth’s surface features”
  3. 3. Wearing Down Earth’s Surface • Erosion: Destructive force in which pieces of rock moved by water, wind, or moving ice. • Sediment: Small pieces of rock. • Weathering: Destructive force that breaks down rocks into smaller pieces.
  4. 4. Weathering • Weathering is a destructive force that breaks down the rocks. • Mechanical weathering is the breaking of larger rock into smaller pieces of rock, called sediment.
  5. 5. Weathering • Ice, water, (running water, rain), wind, growing roots, and falling rocks are the principal agents that cause mechanical weathering. • Chemical weathering: In chemical weathering, rocks change into other materials. • Water is the main factor that causes chemical weathering. Water can dissolve some minerals that make up rocks. (Video) • Water can also dissolve some chemicals in the air and soil forming a weak acid that dissolve some minerals, changing the composition of the rocks.
  6. 6. Erosion • Erosion is a destructive force that carries away sediments by moving water, wind, or moving ice. As these elements flow, they carry away the sediment that has been weathered away from rocks.
  7. 7. • As water flows, the rushing water weathers rock by dissolving the minerals in it. At the same time it erodes the river bank by carrying away the sediment. Over the years, streams form valleys, and as streams turn into rivers, rivers create canyons.
  8. 8. • Weathering and erosion have shaped the form of the mountains and landscape by carving them out, rounding them and giving them strange shapes.
  9. 9. Deposition • Deposition is a constructive force in which sediments are dropped or released in another place by wind or moving water or ice. • It is a constructive force as it builds up the land.
  10. 10. • Deposition helps create a variety of surface such as deltas and alluvial fans.

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