the success and growth of the Indian Ocean trade indicate the role of the state that was promoted mostly by autonomous port cities.
The ocean is a vast body of salt water that covers about 71% of the earth's surface. The Earth has a global ocean, but oceanographers and the world's nations traditionally divide it into four distinct regions: the Pacific, Atlantic, Indian, and Arctic Oceans. The seven oceans include the Arctic Ocean, North Atlantic, South Atlantic, North Pacific, South Pacific, Indian Ocean, and Southern Ocean.
The oceans contain about 321 million cubic miles (1.34 billion cubic kilometers) of water, which is about 97% of the earth's water supply. Sea water has a dissolved salt content of approximately 3.5% by weight. The sea is also rich in chlorine, magnesium, and calcium.
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