Question

which action would best help prevent groundwater erosion?
using breakwaters
packing down soil
building drains with outlets
increasing the slopes of riverbanks

Explanation:

To prevent groundwater erosion, we analyze each option:

• Breakwaters are for coastal erosion, not groundwater.
• Packing down soil reduces pore space but doesn't address groundwater flow.
• Building drains with outlets helps redirect groundwater, reducing its erosive force by controlling flow.
• Increasing riverbank slopes increases surface erosion, not prevent groundwater erosion.

So building drains with outlets is the best action.

Answer:

C. building drains with outlets (assuming the options are labeled A - D as: A. using breakwaters, B. packing down soil, C. building drains with outlets, D. increasing the slopes of riverbanks)