Wave power is a [?] energy resource, needs no [?] and produces no pollution.

There are several ways to get energy from waves.

One is to use the waves to make [?] bob up and down in a chamber, allowing [?] to be blown in and out of the top which can drive a [?] and a generator.

Another is to tether objects where the [?] can move them up and down or back and forth, and use this [?] to drive generators.

A wave power station must be built where waves are [?] and [?], must be able to generate during [?] weather and yet withstand violent [?].