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For the first time ever, the starlight camera captures sea creatures' bioluminescent paths, and the ocean glows with light.

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6. Extra: Think you know your stuff? Take this quiz on vent geography and chemistry.

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6. Extra: Think you know your stuff? Take this quiz on vent geography and chemistry.

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In 1979, scientists in Alvin dove to the Mid-Ocean Ridge in the eastern Pacific. A spectacular sight greeted them. Clouds of what looked like black smoke were billowing from tall chimneys on the ocean floor.

Explore vent basics, vents around the world, vent chemistry, boiling points, videos, and test what you've learned with a quiz!

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In 1979, scientists in Alvin dove to the Mid-Ocean Ridge in the eastern Pacific. A spectacular sight greeted them. Clouds of what looked like black smoke were billowing from tall chimneys on the ocean floor. Explore vent basics, vents around the world, vent chemistry, boiling points, videos, and test what you've learned with a quiz!

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3. Read about the creatures that inhabit thermal vents. Click the links on the left to learn more.

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3. Read about the creatures that inhabit thermal vents. Click the links on the left to learn more.

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Tubeworms resemble giant tubes of lipstick. They live neary hydrothermal vents and have a symbiotic relationship with chemosynthetic bacteria. The bacteria enters their body when tubeworms are young and have mouths and guts. As they grow, those features begin to disappear. Millions of bacteria inside a tubeworm convert chemicals from hydrothermal vents into energy.

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2. Watch: Video Footage of Animal Life on a Vent

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2. Watch: Video Footage of Animal Life on a Vent

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The Depths Below - Life on a Vent | Ocean Today

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The earth cracks open. Fluid and minerals spew up from the seafloor. Water shimmers. Life abounds. We're looking at hydrothermal vents, originally discovered near the Galapagos Rift in 1977. Basically, a hydrothermal vent is a hot spring produced by underwater volcanoes or tectonic activity.

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1. Watch: Video Footage of Underwater Vents and Volcanoes

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1. Watch: Video Footage of Underwater Vents and Volcanoes

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Underwater Vents and Volcanoes | Ocean Today

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It's hard to find vents and active volcanoes in the deep ocean. To do so, scientists can use a CTD instrument package that measures the conductivity, temperature, and depth in the ocean. Changes in temperature and the cloudiness of the water may be a sign of a hot spring site or erupting underwater volcano.