Answer:
It is a positive declarative sentence.
Explanation:
The question is rather vague. There are many different kinds of sentences. Usually when you're talking about "types" of sentences in a general sense, you're talking about the four types (declarative, interrogative, exclamatory, and imperative). In the case of your sentence, it is a declarative sentence since it is making a statement. It is a positive declarative because it is stating that something does happen. If instead the sentence said that the wind and rain and sea do not produce waves then it would be a negative declarative sentence.
