Describe how resources used to generate electricity
have changed over time​

A Dynamic Energy Mix

The types of energy used in the United States have changed over time. The change has been driven by advances in technology, energy resource discoveries, energy prices, social pressures and other factors. The only constant is that the amount of energy used has increased steadily over time.

Explanation:

answer; /// during daylight hours the sun heats up the ground,and at night the clouds insulate the warmth making it warmer ;