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An ocean is a huge body of salt water. Oceans cover 71% of the Earth's surface and contains 98% of all the water on Earth. The oceans are the Pacific, the Atlantic, the Indian, the Arctic and the Southern and Arctic. The largest ocean animal is the blue whale. The world's oceans are important to life on earth because they provide food, minerals, oil and natural gas. There are many dangers threatening the health of the oceans including pollution.