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     Earth is the only planet in the Solar System that has liquid water. The ocean contains ninety seven percent of the earth’s water and covers almost three quarters of the planet. There are four different oceans, the Pacific, Atlantic, Indian, and the Arctic. Tides and currents occur in all three of these oceans. Many different kinds of fish and mammals also make their homes in these oceans. All of these oceans are connected to each other in some way. Humans find oceans to be very interesting, beautiful, and exploring.
All oceans contain salt water and other minerals. The Pacific Ocean has the largest body of water in it. It spreads nearly halfway around the world. The Pacific Ocean is also the deepest ocean out of all four oceans. The Atlantic contains the second largest body of water. Next is the Indian Ocean, which is on the borderline of being a big ocean and a small ocean. Last is the Arctic Ocean, which by all means is the smallest ocean of them all, and the shallowest.
     Tides are common features of the ocean. Tides occur when large bodies water rise and fall, because of the gravitational pull of the moon and the sun. Spring tides are especially strong tides; in spite of the name they have nothing to do with the season spring. They occur when the Earth, the sun, and the moon are in a line. Spring tides occur during the full moon and the new moon. Neap tides are especially weak tides. They occur when the gravitational forces of the moon and the sun are perpendicular to one another. When water moves from side to side, it is called a current. Currents move warm and cold water to different parts of the ocean.
     Ocean water is often referred to as salt water. Ocean water becomes salty as water flows in rivers, it picks up small amount of mineral salts form rocks and soil of the riverbeds. This very-slightly salty water flows into the oceans. The water in the oceans only leaves by evaporating, but the salt remains dissolved in the ocean, it does not evaporate. So the remaining water gets saltier and saltier as time goes on.
     Animals of the ocean are really interesting and fun to learn about. Many of the oceans fish use what is called a coral as a nursery and a home. This coral also serves as a shelter to the fish from other big creatures that may want to eat them.

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Other creatures like sharks and eels can find a home there too. Sharks swim above the bed of the coral, while eels live between the coral. There many other creatures that live on the ocean floor, like lobsters and crabs, and some which don’t really look like animals, for example, anemanies, sea cucumbers, snails, and starfishes. They come in different colors shapes and sizes. Anemanies are beautiful spiked creatures that are sometimes a threat for starfish when they’re overpopulated, because they are faster and they eat them for food. On the other hand starfish eat plankton, and they crawl on the ground peacefully, and don’t disturb others.
     The Ocean is one of the main attractions in human lives all around the world. Humans discovered oceans in the early 1400’s; well of course then it was just a large body of water to them. Humans used oceans to explore the world and as a mean of traveling. If it weren’t for oceans, America probably would have not been found until decades after Columbus died. Humans still explore the ocean. They also use the ocean for their own personal hobbies like surfing, diving, fishing, swimming, and for taking vacations.
     Oceans play a major part in the worlds existence. Without oceans, life would be different. Oceans are at a high risk of pollution. If the ocean is continued to be polluted, thousands of animals will loose their homes, the human food source would run low, water would be scarce, and the beautiful ocean will become nothing but an dried up junk yard and oil feel.
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