Erosion and Deposition: Wind, Gravity, and Living Things — Quiz
Question 10 • Earth and Space Science
A conservation team is studying a wetland that has recently expanded due to a large beaver dam. Nearby, they notice new plants growing along the water’s edge and fewer signs of erosion on the banks. The team wants to understand whether the beavers are playing a role in reducing erosion in the area. Which explanation best connects the beavers’ actions to reduced erosion in this environment?
Answer
A
The beaver dam slows water flow, allowing soil to settle and vegetation to grow.
B
The beaver dam increases water speed, which clears out sediment.
C
The dam fully blocks water movement, eliminating erosion entirely.
D
The beavers remove plants, which causes sediment to move downstream.
Explanation
A beaver dam slows the water moving through the wetland. Slower water carries less soil away, so sediment can settle along the banks and create places for plants to grow. Plant roots then help hold the soil in place, further reducing erosion. The dam does not stop all water movement, so choice C is too absolute.
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