Hydro-electricity, Waves and Tides

________ are produced by the gravitational pull of the Sun and Moon.

________ is never likely to provide energy on a large scale, but it can be very useful on small islands.

________ usually requires the flooding of a valley by building a big dam.

Like with ________, the moving turbines are connected to a generator.

________ are big dams built across river estuaries, with turbines in them.

________ are pretty reliable as they happen twice a day without fail.

________ uses Falling Water.

________- Using the Sun and Moons Gravity.

________ are used in lots of ways to generate electricity.

______is used on small scales