What process leads to water entering an aquifer?
o a. evaporation
o b. transpiration
o c. percolation
o d. condensation

Percolation

Explanation: When it rains or snows, ground water slowly filters through the soil because of gravity. An aquifer or water table is the area underground in which water gathers, where there are spaces between gravel, sand or clay. At some point (generally when the water seeps to the  rocky bottom layer), the spaces will become saturated and water will take the path of least resistance, flowing into the nearest body of water until at last it evaporates and becomes water vapor in the air, finally falling again as precipitation.

the speed increase from w to x due to increased gravity force

the speed decreases from x to y due to decrease in gravity