Basalt, a dark volcanic rock, primarily makes up the ocean basins' foundation.
What five oceans are there? The Pacific Ocean, Atlantic, Indian Ocean, Arctic Ocean, and Southern Ocean are the five names of the oceans. Today, the earth's surface is covered by five bodies of water, including our one world ocean, five oceans (also known as Ocean 5), and two seas, which together account for more than 97 percent of the planet's water.
According to geological evidence, the oceans may well have locked at least twice in the past. The previous occurrence was about 650 million years old. The fossil record is poor, yet enough single-celled animals did survive that cataclysm to repopulate the Earth.
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