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Large hailstones fall at up to 72 mph

Hailstones 2 to 4 inches wide are expected to fall at between 44 and 72 miles per hour.

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Smaller stones fall more slowly. Hail under an inch across comes down at 9 to 25 miles per hour.

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Open NOAA National Severe Storms Laboratory

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Deep-sea vents top 700 degrees without boiling

Seawater in hydrothermal vents can reach over 700 degrees Fahrenheit, yet it does not boil because of the extreme pressure.

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The largest tree on Earth is a giant sequoia

The General Sherman Tree is the largest tree in the world by volume, at an estimated 52,500 cubic feet.

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Kelp can grow 18 inches in a day

In ideal conditions, kelp can grow up to 18 inches per day.

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