Review#7weathering,erosion, deposition
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Review#7weathering,erosion, deposition

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Review#7weathering,erosion, deposition Review#7weathering,erosion, deposition Presentation Transcript

  • L.O:weathering, erosion, deposition
  • When rocks are exposed to theenvironment, they can weather (breakdown).
  • Weathering when rocks breakdown intosediment (rock particles)because they are exposed to theenvironment
  • Two kinds: physical and chemicalweathering
  • Physical weathering rocks breakdowninto sediment (small rock particles)caused by ice or biological activity
  • Chemical weathering: when theminerals in rocks dissolve or rustfrom oxygen or acid rainChemical weathering happens in warm (hot) andhumid (wet) environments.
  • Water is the greatest cause ofweathering.
  • Small rocks weather faster than bigrocks
  • Small rocks weather faster than bigrocks
  • Rocks with soft minerals are lessresistant to weathering
  • Rocks with harder minerals are moreresistant to weathering
  • Soil is the result of the weathering ofrocks and biological activity.
  • Erosion: when sediment (rockparticles) are transported away.Wind, gravity, ice (glaciers) andespecially running water are agentsof erosion
  • Streams:Streams (rivers) are moving water.
  • A stream’s velocity depends on its• Gradient (slope)• Discharge (volume of water it carries)
  • The meander (outside of the bend) ofa stream has the MOST erosion.
  • “C” has most erosion
  • Inside the bend (meander) has mostdeposition (“A”).
  • Which has more erosion? Which hasmore deposit?
  • Streams create V-shaped valleys
  • Streams create V-shaped valleys
  • Complete page 74.
  • Glaciers are huge slow-moving“rivers of ice”.Glaciers transport all sizes of rocks asthey move.
  • Glaciers create U-shaped valleys.
  • Deposition:When agents of erosion deposit thesediments they carry.
  • Deposition: When agents of erosiondeposit the sediments they carry.
  • Streams deposit sediment withhorizontal sorting.• As a stream slows down: theLargest, heaviest, Roundest and densestparticles are deposited first.
  • Glaciers deposit unsorted (mixed-uprocks) piles .