Topic 5: Lesson 3 - Water Erosion

Order the steps of the process of water collection into the correct order from first to last.

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

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

• Many rills flow together to form a gully.

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

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

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How does water shape Earth’s surface?

• Moving water breaks up rock into smaller pieces and carries sediment through erosion.

• Water does not shape Earth's surface. Only wind changes the Earth.

• Water flows uphill, carving out valleys.

• Water freezes to form waterfalls.

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What happens to the sediment as it flows downstream? What process takes place as the river slows down?

• Deposition

• Erosion

• Suspension

• Transportation

Where is the greatest amount of erosion occurring at a waterfall?

• at the top of the falls

• at the bottom of the falls

• downstream from the falls

• upstream from the falls

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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

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What is the main way the hydrosphere interacts with the geosphere in the formation of waterfalls?

• Wind blows against the rocks creating a cliff.

• Water moves over the land, wearing down rocks and different rates.

• Plant roots break off the rock at the bottom of a mountain creating a waterfall.

• Waterfall formation has nothing to do with the hydrosphere or geosphere.

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If you wanted to make more sand erode in the model river and delta, what could you do?

• decrease the tilt of the tray

• decrease the amount of water you pour in

• increase the tilt of the tray

• pour the water more slowly

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The sand that was deposited at the bottom of the tray was to model the formation of a ___.

• sinkhole

• flood plain

• gully

• delta

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