Topic 5 Lesson 3: Water Erosion Quiz

Order the steps of the process of water collection into the correct order with the first step at the top and the last step at the bottom.

• Many rills flow together to form a gully.

• Rivers flow until they meet a large body of water, depositing sediment at the mouth.

• Rain falls from the sky to Earth's surface.

• Raindrops collect, forming puddles that cause runoff to flow downhill.

• Streams flow over Earth's surface, carrying sediment along with them.

Amy hikes down into the Grand Canyon to see Havasu Falls, a waterfall famous for its blue-green water and rock formations.

How does water shape Earth's surface? What is the main way the hydrosphere interacts with the geosphere at Havasu Falls? Explain how this process forms waterfalls (Choose all that apply)

• D. physical weathering from water breaks rock into small pieces

• B. chemical weathering from air in the cave

• C. physical weathering from animals burrowing

• A. water erosion caries sediment away.

Amy walks up to the rapidly-flowing river at the waterfall. She observes it transporting a lot of sediment. What happens to the sediment as it flows downstream? To find out, she goes to the end of the steep canyon where the river becomes wider and shallower. What process takes place as the river slows down?

• D. chemical weathering

• C. deposition

• B. physical erosion

• A. runoff

Where is the greatest amount of erosion occurring?

• A. at the top of the falls

• D. upstream from the falls

• B. at the bottom of the falls

• C. downstream from the falls

Mack is making a model of a river. He places sand in a pan, places one end of the pan on some books so it is tilted, and then pours water on it. He observes the amount of sand that is eroded by the water. Next, he repeats the experiment, trying to erode more sand than before. To cause more sand to erode, Mack can

• increase the tilt

• decrease the tilt

• decrease the amount of water

• pour the water more slowly

Mack notices that sand is deposited at the end of his river model. This landform in the model represents a

• delta

• gully

• flood plain

• sinkhole

Spelunkers study caves. When exploring caves, they wear safety gear such as a helmet with a light and knee and elbow pads. Spelunkers can see many beautiful formations when looking in a cave. What causes caves to form?

• A. physical weathering from wind

• B. chemical weathering from air in the cave

• C. physical weathering from animals burrowing

• D. chemical weathering from water underground