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GPS satellites circle Earth twice a day

GPS satellites fly at an altitude of about 20,200 kilometers, and each one circles Earth twice a day.

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The satellites are arranged so that at least four can be seen from virtually any point on the planet.

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Seawater freezes at about 28 degrees Fahrenheit

Fresh water freezes at 32 degrees Fahrenheit, but seawater freezes at about 28.4 degrees because of the salt in it.

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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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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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