4th grade-ch. 9 lesson 2 how do weathered materials move
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Ch. 9Lesson 2How do
weathered materials move?
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erosion• process of moving weathered
rock by water, wind, ice & gravity
• creates canyons & valleys
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•Waves constantly change the shape of the
shoreline.
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Rivers can make deep canyons by erosion.
Grand Canyon
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glacier•large ice sheet in cold place
•causes erosion
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Glaciers
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As a glacier melts, it wears away bits of rock and soil.
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Glaciers [02:40]
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deposition• laying down of pieces of
Earth’s surface• Builds up Earth’s surface
Weathering and Erosion YouTube video
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creates deltas – fan shaped area of land
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sand dunes
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•rapid downhill movement of a large amount of rock & soil
- caused by gravity
landslide
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landslide
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avalanche• large amounts of snow & ice that fall rapidly down a mountain
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Avalanche Control Team in Anchorage [03:34]
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avalanche
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ways to help reduce erosion
1. grow plants on hills to prevent erosion
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ways to help reduce erosion
2. terracing- slows speed of rainfall
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terracingbuilding of step like ridges in hilly areas to prevent water runoff
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ways to help reduce erosion
3. build barriers to prevent waves
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2 ways to stop erosion
of sand
1. jetty 2. sea wall
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Fort Lauderdale beach sea wallFort Lauderdale beach sea wall
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seawall
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Activity- At the Beach• Problem: How do waves affect the beach?• Hypothesis: I predict that the waves will affect the
beach by _____. I predict that a jetty will help by _______.
• Procedure: 1. Shape sand into a beach.2. Pour water into side of pan opposite beach.3. Make waves with popsicle stick.4. Make beach again.5. Make a jetty by piling pebbles in a line in middle of
tray.6. Make waves with popsicle stick.• Observations:
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Activity-Hills & Valleys
• Problem: How does moving water shape the
land ?
• Hypothesis: I predict that moving water (rain)
will cause the salt (mineral) to __________.
• Observations: _________________________
• Conclusion: ___________________________