Ocean is a very large body of saltwater that covers most of Earth’s surface. Oceans are deeper and larger than seas and connect across the globe. There are five main oceans: the Pacific, Atlantic, Indian, Southern, and Arctic. Oceans contain moving water, waves, and currents.

Oceans formed billions of years ago and continue to exist today. They are found all around the world and cover most of the planet. Oceans are home to many marine plants and animals. People also use oceans for activities such as shipping and fishing.