Scientists estimate that the formation of the Ogallala aquifer began several geologic epochs ago, when the Rocky Mountains were still tectonically active. Over time, sediment from the Rocky Mountains eroded and was deposited over rivers and valleys on the eastern side of the mountains, eventually covering them and trapping water below the surface to form the aquifer. A. Geologic processes that occur in modern times did not occur earlier in Earth's history.
B. Past geologic processes impact the present-day location of resources on Earth
C. Past geologic processes have resulted in an even distribution of resources on Earth
D. Geologic processes have very little impact on the distribution of resources on Earth

Today the Ogallala aquifer is a very important source of fresh water, supplying about 30% of the total ground water used for irrigation in the United States. The Ogallala aquifer also provides drinking water to many people who live in the central United States.

Based on the information above, which of the following is true?