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(Music)

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JOAN CARTAN-HANSEN, HOST

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Just as there are different

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habitats on land, there are

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different habitats under the

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ocean.

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There are seagrass meadows.

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These are found in shallow

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waters and are home to hundreds

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of species.

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There are kelp forests.

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Kelp forests are found not far

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from 20 percent of the world's

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coastlines.

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And while it looks like a plant,

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kelp is actually a type of brown

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algae.

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There is the intertidal zone,

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the habitat between low and high

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tide.

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And the estuary zone, a habitat

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with a mixture of salt and fresh

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water.

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And there are reefs.

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A reef is an underwater ridge.

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It can be made of rock, coral,

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or oyster.

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Coral reefs are particularly

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important.

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They're found in less than one

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percent of the ocean but are

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home to more than 25 percent of

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the ocean's plants and species.

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Coral reefs are in trouble

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because they're easily damaged

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by climate change and human

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interactions.

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And because reefs are an

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essential habitat, scientists

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are creating artificial reefs to

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give some creatures a new home.

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And finally, there's the open

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ocean habitat.

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This zone has nothing but water

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and sea creatures.

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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