What are the causes of variations ? please explain thi also​

The energy of blowing wind can be harnessed to create electricity. why is wind considered a renewable energy source? a) wind does not cause destruction of the environment. b) wind turns the blades of a windmill that creates electricity. c) wind provides only a very small amount of electricity to the united states. d) wind comes from atmospheric conditions that are available indefinitely.

Ais a landform that is formed at the mouth of a river from the deposition of sediment carried by the river as the water flows.

Which law represents a balanced chemical equation?