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A nautical mile is one minute of latitude

One nautical mile equals one minute of latitude, or about 1.15 land miles.

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The unit is based on Earth's latitude and longitude coordinates, which suits navigation at sea. One knot is a speed of one nautical mile per hour.

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The ocean holds 97 percent of Earth's water

About 97 percent of all the water on Earth is in the ocean.

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The strongest recorded earthquake was magnitude 9.5

The largest earthquake recorded since 1900 struck Chile on May 22, 1960, at magnitude 9.5.

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Some beach sand is parrotfish poop

Parrotfish grind up coral reef material in their guts and excrete it as sand.

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