In the 1900s, many hydroelectric dams were built in order to harness the energy of moving water. The dams supplied a clean source of renewable energy, but they did cause other environmental problems. Which of the following resources was no longer quickly renewed because of the hydroelectric dams? A.
fertile sediments in flood plains and deltas
B.
the amount of wind energy blowing across the rivers' watersheds
C.
beds of coal and other fossil fuels found in the rivers' valleys
D.
sources of fresh water, such as springs and glaciers