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The largest waterfall on Earth is underwater

The world's largest waterfall is in the ocean beneath the Denmark Strait.

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Cold, dense water from the Nordic Seas sinks below warmer water from the Irminger Sea and pours over a huge drop in the ocean floor. The flow is estimated at more than 123 million cubic feet per second.

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Yellowstone has more than 500 geysers

Yellowstone has more than 10,000 hydrothermal features, and more than 500 of them are geysers.

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Mauna Loa is the largest active volcano on Earth

Mauna Loa in Hawaii is the largest active volcano on the planet.

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Most of Earth's volcanoes are on the seafloor

The greatest number of Earth's volcanoes occur on the ocean floor.

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