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Published byLjubinka Rozman Modified over 6 years ago
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Aim: How can we describe erosion caused by running water, wind, and glaciers?
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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 Creates rounded and frosted sediments
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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.
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Direction of grooves shows direction of movement
Carves a U-shaped valley Creates semi-rounded and scratched sediments
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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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▲ indicates the fastest velocity
Top View of River Cross Section of River at dashed lines ▲ ▲ ▲ ▲ indicates the fastest velocity DELTA
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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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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
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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
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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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