Water can be used to create electricity. this type of energy is called

If you have to choose only term, hydropower is the generic word for all these energy sources.

But if you wanna be more specific, you have hydroelectric power, the one that uses a dam to extract energy from the flow a the river, wave power, which uses special buoys attached to get energy from sea waves, and tidal power, similar to the hydroelectric, but it gets energy from the marine currents instead of the river ones.

On the galapagos islands charles studied finches