Final answer:
Oceans are large and often deep bodies of water that are distinct from rivers and lakes. They cover most of the Earth's surface and contain saltwater.
Step-by-step explanation:
Oceans are not landforms, but rather vast bodies of water covering most of the Earth's surface. They are large and often deep, and make up about 71% of the planet's surface. Unlike rivers and lakes, oceans contain saltwater - water that is filled with dissolved salts and minerals - making them distinct from bodies of fresh water.
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