Today, I want to write something about oceans. There are five oceans on the world. They are: Pacific Ocean, Atlantic Ocean, Indian Ocean, Arctic Ocean, and Antarctic Ocean. Pacific Ocean is the biggest ocean. Arctic Ocean and Antarctic Ocean are the coldest oceans. Antarctic Ocean is not famous in China. So, when I am young, I thought there are only four oceans on the world. Antarctic Ocean is the only ocean that crosses any longitude. Some people don’t think Antarctic Ocean is a ocean, because it has not a mid - ocean ridge.