1.
What can shape the surfaces of the Earth? Think of all the possibilities (several)

Wind, water, earthquakes and other natural disasters, avalanches, tsunamis, cyclones, hurricanes, deforestation will cause loss if vegetation cover and land will no longer be immune to wind and water erosion, weathering, etc.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

i wish i could with all of them i can barley see the first one so here's the answer to the first one b