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JOAN CARTAN-HANSEN, HOST: The

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ocean is divided into five

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different zones based on depth.

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The Sunlight Zone goes down

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about 200 meters or 65 feet.

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It is warm and sunny with lots

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of plants and sea life.

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Next is the Twilight Zone.

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It goes down from 200 to a

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thousand meters.

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Only a small amount of sun light

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can get this deep.

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The creatures here have large

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eyes to see in the gloom.

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This zone is home to more fish

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than the rest of the ocean.

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Between one thousand meters and

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four thousand meters in depth is

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the Midnight Zone.

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There's no sunlight here, so the

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animals may have their own glow.

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From four thousand to six

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thousand feet deep is the

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Abyssal Zone.

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Here, it's pitch black, and the

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water is nearly freezing.

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And finally, from six thousand

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meters to the bottom of the

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ocean is the Trench Zone.

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We know very little about what

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lives down there because it's so

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difficult to explore.

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In fact, only about ten percent

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of the entire ocean's surface

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has been surveyed.

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More people have been to the

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moon than have been to the

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deepest part of the ocean.

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For more information about

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oceans, check out the Science

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Trek website.

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You'll find it at

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ScienceTrek.org