posted by AUTUMNN AND ASHLEYY NEED HELP! .
what is necessary for a wave?
What is necessary for a wave to form or what? I wish you would expend your question a bit.
Your answer could probably be that for a wave to form wind needs to blow across the water's surface, transmitting their energy to water. From there a wave forms, getting larger as it gets closer to the shore.
I'm just going to say wind and water