The Atlantic Ocean is the world's second largest ocean. It covers a total area of about 106,400,000 square kilometres (41,100,000 square miles). It covers about 20 percent of the Earth's surface. It is named after the godAtlas from Greek mythology. Its name means "Sea of Atlas."
The east coast of South America is shaped somewhat like the west coast of Africa, and this gave a clue that continents moved over long periods of time (continental drift). The Atlantic Ocean is still growing now, because of sea-floor spreading from the mid-Atlantic Ridge, while the Pacific Ocean is said to be shrinking because the sea floor is folding under itself or subducting into the mantle.