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Wind Erosion Sandblasting (abrasion) – occurs when winds blow sand or silt grains against rocks and other objects Lower portions of rocks become more eroded.

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Presentation on theme: "Wind Erosion Sandblasting (abrasion) – occurs when winds blow sand or silt grains against rocks and other objects Lower portions of rocks become more eroded."— Presentation transcript:

1 Aim: How can we describe erosion caused by running water, wind, and glaciers?

2 Wind Erosion Sandblasting (abrasion) – occurs when winds blow sand or silt grains against rocks and other objects Lower portions of rocks become more eroded Creates rounded and frosted sediments

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5 Glacier Erosion Glacier – naturally created mass of ice and snow, moves under influence of gravity Act like a “river of ice” Creates parallel scratches and grooves in rock as it moves.

6 Direction of grooves shows direction of movement
Carves a U-shaped valley Creates semi-rounded and scratched sediments

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11 Running Water Erosion Most common erosion type
Includes rivers, streams, and waves Greater velocity transports larger particles Creates smooth and rounded sediments

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13 ▲ indicates the fastest velocity
Top View of River Cross Section of River at dashed lines ▲ indicates the fastest velocity DELTA

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16 Streams carve v-shaped valley’s
Three factor’s determine stream velocity: Gradient – the steeper the slope, the faster the river Discharge – the more water, the faster the river Stream Channel Shape – wide rivers run slow, narrow rivers run fast

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18 Diameter What is the minimum rate of flow at which
a stream of water can maintain the transportation of sediments? Diameter Rate of Flow 6.4 cm 0.2 cm 1.0 cm 25.6 cm

19 Name each particle size according to page 6 of the ESRT:
Diameter Particle Size Name 0.008 cm 0.5 cm cm 7.5 cm 36.2 cm 5.3 cm 0.003 cm

20 Erosion Caused by Gravity
Everything that goes up…… ….must come DOWN Mudslides, landslide, rockslides and rockfalls are examples of erosion caused by gravity. AKA Mass movement


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