Erosion and Deposition: Wind, Gravity, and Living Things — Quiz
Question 5 • Earth and Space Science
After large tracts of mangrove forest were removed along a tropical coastline, researchers observed measurable shoreline retreat within five years. Which statement best explains this outcome?
Answer
A
The removal of vegetation increased direct exposure of coastal sediment to water’s forces.
B
Reduced canopy cover altered surface temperature but had limited effect on sediment displacement.
C
Vegetation loss interfered with microclimate balance but did not significantly affect sediment transport.
D
The loss of root systems reduced soil cohesion but did not directly increase shoreline erosion.
Explanation
Mangroves help protect shorelines because their roots and vegetation hold sediment in place and reduce the force of waves and currents. Removing large areas exposes coastal sediment directly to those forces, allowing it to be carried away and the shoreline to retreat. Choice D recognizes that roots support soil cohesion, but incorrectly says this would not directly increase erosion.
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