Atlantic Ocean

The Atlantic Ocean covers around 20 percent of the Earth's surface, and it's about one half the size of the Pacific. And, one of the Atlantic's "standout features" is the massive chain of undersea mountains called the "Mid-Atlantic Ridge". This ridge stretches from the edge of the Arctic to the south parts of Antarctica. It curves like a snake, and the total length is 10,000 miles, which makes it the world's longest mountain chain. It's four times the Himalayas, the Andes, and the Rocky Mountains combined! The Atlantic also contains the world's largest island, which is Greenland. Icebergs snap off of Greenland's frozen climate and float in waters of the North Atlantic. In the mid-Atlantic, the climate's a lot warmer and more tropical. Some of the biggest seas are in the Atlantic, including the North Sea, known for its oil reserves. Also, the Mediterranean, which is "busy with ship traffic", and the Caribbean Sea, which is known for it's clear, tropical-feeling water.