Weathering, Erosion and Deposition

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Weathering, Erosion and Deposition

• BY BRIANNA SHIELDS

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DO NOW

• How are igneous rocks made?
• When rocks are pushed into the mantle, what do
  they become?
• Where do sedimentary rocks typically form?

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Weathering

• The breaking down of rocks on the Earths surface
  without carrying them away

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Types of Weathering

• Mechanical Weathering

• Rocks are physically broken into smaller pieces
• Rocks chemical makeup stays the same

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Types of Weathering

• Chemical Weathering

• Minerals in the rock change
• New minerals created by chem. reaction

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Weathering Video

• What are atleast three types of weathering?

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(No Transcript)
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Weathering

• Mechanical
• Cracking due to temp changes
• Frozen water cracks
• Rootpry
• Landslides
• Abrasion by wind

• Chemical
• Water dissolving
• Oxygen reactions
• Co2 in rain (pollution)
• Acid rain
• Plant acids

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Erosion and Deposition

• Erosion
• Deposition

• Weathered rock particles are carried away
• Eroded rock particles are dumped off in a new
  location

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What are 2 major causes of erosion?
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Erosion and Deposition

• Gravity

• How does it erode?
• Pulls rocks down slopes
• How does it deposit?
• Materials pile up at lower elevations

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GRAVITY
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Erosion and Deposition

• Wind

• How does it erode?
• Carries loose rocks through air- scrapes at other
  rocks
• FAST carries more
• How does it deposit?
• When it slows down, dumps off rocks to form
  dunes/piles

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Wind Erosion
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Wind Erosion
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Erosion and Deposition

• Running Water

• How does it erode?
• Drags rocks along in water
• Bumping of rocks widens and deepens waterways
• FASTER carries more
• How does it deposit?
• Where water slows down, rocks are dumped off
• Form deltas/fans or plains

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Running Water
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Running Water
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Erosion and Deposition

• Glaciers

• How does it erode?
• Moving mass of ice
• Picks up and drags rock- grinds across other
  rocks
• Digs into land, widens valleys
• How does it deposit?
• Rocks dump when glacier melts
• Makes moraines and drumlins

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Glaciers
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Glaciers
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Glacial Striations
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Glacial Drumlins
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Glacial Drumlins and Valleys
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Erosion and Deposition

• Waves

• How does it erode?
• Crashing waves chip away at rocks
• Abrasion forms cliffs, arches and caves
• How does it deposit?
• Carried particles are dumped on shore
• Form beaches, sand bars, spits

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Wave Erosion
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Beach Erosion
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Sandbars
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Sea Arch
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Sea Arches
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Sea Cave
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Sea Cliff
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Sea Cliffs and Stacks
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Assessment

• Quiz
• Weathering and Soil Packet