4th Grade-Ch. 9 Lesson 2 How do weathered materials move
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Transcript of 4th Grade-Ch. 9 Lesson 2 How do weathered materials move
Ch. 9Lesson 2How do
weathered materials move?
erosion• process of moving weathered
rock by water, wind, ice & gravity
• creates canyons & valleys
•Waves constantly change the shape of the
shoreline.
Rivers can make deep canyons by erosion.
Grand Canyon
glacier•large ice sheet in cold place
•causes erosion
Glaciers
As a glacier melts, it wears away bits of rock and soil.
Glaciers [02:40]
deposition• laying down of pieces of
Earth’s surface• Builds up Earth’s surface
Weathering and Erosion YouTube video
creates deltas – fan shaped area of land
sand dunes
•rapid downhill movement of a large amount of rock & soil
- caused by gravity
landslide
landslide
avalanche• large amounts of snow & ice that fall rapidly down a mountain
Avalanche Control Team in Anchorage [03:34]
avalanche
ways to help reduce erosion
1. grow plants on hills to prevent erosion
ways to help reduce erosion
2. terracing- slows speed of rainfall
terracingbuilding of step like ridges in hilly areas to prevent water runoff
ways to help reduce erosion
3. build barriers to prevent waves
2 ways to stop erosion
of sand
1. jetty 2. sea wall
Fort Lauderdale beach sea wallFort Lauderdale beach sea wall
seawall
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:
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: ___________________________