Ocean fact

-Around 70% of the Earth’s surface is covered by oceans.

-Ocean tides are caused by the Earth rotating while the Moon and Sun’s gravitational pull acts on ocean water.

-While there are hundreds of thousands of known marine life forms, there are many that are yet to be discovered, some scientists suggest that there could actually be millions of marine life forms out there.

-During winter the Arctic Ocean is almost completely covered in sea ice

you can fin more facts about ocean in http://www.sciencekids.co.nz/sciencefacts/earth/oceans.html