Isaac newton’s investigations of gravity explained which of the following?

a. earth is not the center of the universe.

b. jupiter has more moons than earth.

c. gravity acts on all objects in the universe.

d. the sun is more massive than earth.

Hydroelectricity provides about 7 percent of the electricity generated in the united states. (a) explain how a hydroelectric power plant converts energy stored in water into electricity. (b) identify two factors that determine the amount of electricity that can be generated by an individual hydroelectricity power plant. (c) describe the two main types of land-based hydroelectric power plants. (d) describe two economic advantages and two environmental disadvantages of hydroelectricity.