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Erosion and Deposition


Erosion and Deposition Before we begin Write down the following questions. You will answer these as we go through the powerpoint. 1. What is erosion? – PowerPoint PPT presentation

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Title: Erosion and Deposition

Erosion and Deposition
  • Before we begin Write down the following
    questions. You will answer these as we go through
    the powerpoint.
  • 1. What is erosion? What is deposition?
  • 2. What are the four agents that cause erosion?
  • 3. What is the most influential agent of erosion?
  • 4. What different landforms can streams create?
  • 5. What is created when the roof of a cave
  • 6. How are sea caves, sea arches, and sea stacks
  • 7. How does wind erode rocks?
  • 8. Name three things that gravity can cause due
    to erosion.
  • 9. How do glaciers cause erosion?

Erosion and Deposition
Erosion- process that moves weathered
sediments from one place to another Deposition-
the dropping of sediments that have been
eroded Sediment- The tiny grains of broken down
rock Erosion and deposition are two parts of the
same process. Erosion only occurs when there
is enough energy to carry the sediments.
Deposition occurs when the energy decreases.
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There are four main forces that cause erosion and
deposition 1. Gravity 2. Running Water 3.
Glaciers 4. Wind
  • The most influential force of erosion is water
    due to its ability to move materials from one
    location to another and its vast presence over
  • Examples include bodies of water such as rivers
    and streams.

  • Rivers and streams in the landscape cause erosion
    and deposition and constantly shaping the land.
  • Moving water works with gravity to affect the
    landforms that the water makes.
  • Channel- the path that a stream follows due to
    the erosion from water on soil and rock. As the
    channel gets wider and deeper, canyons and
    valleys can form.

  • When a stream floods, a layer of sediment is
    deposited over the flooded land. Many layers of
    deposited sediment can form a flat area called a

  • When a stream empties into a body of water, such
    as a lake of an ocean, its current slows and
    deposits its load. Streams often deposit their
    load in a fan shaped pattern called a Delta.

Alluvial Fan
  • Alluvial fan is a fan-shaped deposit that forms
    on dry land when a stream flows onto a flat land
    surface from mountains or hills.

  • Groundwater is the water located within the rocks
    below earths surface.
  • Slightly acidic groundwater can cause erosion by
    dissolving rock leading to the formation of caves
  • Sinkhole- occurs when the roof of a cave
    collapses, leaving a circular depression.

Sinkhole Current Event Link
  • http//

What forces shape a shoreline?
  • Waves play a major part in building up and
    breaking down a shoreline.
  • The first parts of the shoreline that waves meet
    are the headlands. The waves slowing waves bend
    towards the headlands, which concentrates the
    waves energy. A huge amount of energy is released
    when waves crash into headlands, causing the land
    to erode.

What coastal landforms are made by erosion?
  • Sea cliff- a cliff that is formed when waves
    strike a cliffs base, wearing away the rock.

Sea Caves, Arches, and Stacks
  • As the rock making up sea cliffs erodes, it
    breaks and cracks. Waves can then cut deeply into
    the cracks and form large holes that continue to
    erode, which are known as sea caves.
  • Sea arch- A sea cave that has eroded even
  • Sea stacks- isolated rock that forms when the
    tops of sea arches collapse.

  • Wind can erode rocks over a long period of time.
  • When wind blows sand and other particles against
    a surface, it can wear down the surface over
  • The grinding and wearing down of rock surfaces
    over time is known as abrasion.

  • Gravity works with other agents of erosion and
    deposition which can result in landslides,
    mudslides, and sinkholes.
  • The force of gravity can move water and ice and
    make rock, soil, snow, or other material move

  • A glacier is a large mass of moving ice that
    forms by the compacting of snow.
  • As glaciers move due to gravity, they pick up
    materials that become embedded in the ice. As the
    glacier moves forward, the materials scratch and
    abrade the rock and soil underneath the glacier,
    causing more erosion
  • Glaciers are also agents of deposition. When a
    glacier melts, it drops materials that it
  • A Glacial drift is the term for all of the
    materials carried and deposited by a glacier.
  • Alpine glacier- A glacier that forms in a
    mountainous area

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