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Inner Space: The Land Beneath the Seas. (OCEAN MATTERS).(Brief Article)
Scientists on an ocean vessel name Melville are mapping the ocean floor off the coast of South America. Using instruments called sonar scanning devices, they have discovered some surprising things.
The ocean floor has many features like those visible on land. Perhaps the most surprising features of the land beneath the seas are volcanoes.
The scientists were surprised to find more than 1,000 volcanoes, called seamounts or volcanic cones. Scientists now believe that there are probably more than 20,000 seamounts under Earth's oceans. Some are more than 1 mile in height. Many of the ocean's seamounts are still active volcanoes.
Why are scientists interested in volcanic activity on the ocean floor? For one thing, many islands on Earth were formed from volcanoes beneath the seas. Iceland in the North Atlantic and Hawaii in the Pacific are two familiar examples. Those islands were created when molten volcanic rock, or magma, piled up high enough to break through the ocean's surface and form the islands.
RELATED ARTICLE: Map an Unseen Object
Scientists use sonar scanning devices to map the ocean floor. They use other methods as well. One is called depth sounding. With one or more partners, use depth sounding to find out the shape of an unseen object in a box to see how scientists study the land beneath the seas.
* what to observe
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Source: HighBeam Research, Inner Space: The Land Beneath the Seas. (OCEAN MATTERS).(Brief...