Oceans give us oil to pump out of the sea. Manganese, cobalt, and nickel are from nodules. All of the oceans are really one ocean put together because all of the oceans give off the same natural resources and nutrients. Tidal power is also a way that the oceans help us. The gravity between the moon and earth causes tides to rise and to make bigger waves.
Tidal power is a way to make electricity from currents.
My opinion is that oceans are important because they give us things we need. We should keep the oceans safe from pollution so that the sea life can be safe. The ocean is more powerful than every man put together.