Question

which process causes wells on land to become saline, making them unusable for drinking water? a) echo sounding b) eutrophication c) groundwater infiltration d) erosion question 6 (5 points) how do tides differ from waves and gravity? a) tides are surface tension.

Explanation:

Echo - sounding is for mapping underwater depths. Eutrophication is about excessive nutrients in water bodies. Erosion is the wearing - away of land. Groundwater infiltration can bring in saltwater if there is a connection between the well and salt - water sources, making wells saline. Tides are caused by the gravitational pull of the moon and sun on the Earth's oceans, while waves are mainly wind - generated and gravity is a fundamental force. Tides are not surface tension.

Answer:

For the first question: C) Groundwater infiltration
For the second question: None of the given options are correct as tides are caused by gravitational forces of the moon and sun on ocean water, not surface tension.