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 glacier melts wears away bits of rock & 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

seawall

2 ways to stop erosion

of sand

1. jetty 2. sea wall

Fort Lauderdale beach sea wallFort Lauderdale beach sea wall

Activity- At the Beach• Problem: How can I prevent waves from eroding a

beach?• Hypothesis: I predict that the waves will affect the

beach by _____. • Procedure: 1. Shape sand into a beach.2. Pour water into side of pan opposite the beach.3. Make waves with a 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: ___________________________