At least 1,000 million grams, or roughly 1,000 tons of material (dust) enters the atmosphere every year and makes its way to Earths surface.

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The xylem of a tree carries water from the roots to the leaves.

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The Antarctic Ice Sheet holds nearly 90 percent of the world's ice and 70 percent of its fresh water. If the entire ice sheet were to melt, sea level would rise by nearly 220 feet.

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Many fish can change sex during the course of their lives. Others, especially rare deep-sea fish, have both male and female sex organs.

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In 1924, Pope Urban VIII threatened to excommunicate snuff users.

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The Antarctic Ice Sheet is almost twice the size of the United States.

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Earth's ocean is made up of more than 20 seas and four oceans: Atlantic, Indian, Arctic, and Pacific, the oldest and the largest.

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Louisiana loses about 30 square miles (78 square kilometers) of land each year to coastal erosion, hurricanes, other natural and human causes and a thing called subsidence, which means sinking.

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Tree roots stabilize the soil and prevent erosion.

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The Pacific Ocean is the largest ocean, covers 64 million square miles (165 million square kilometers). It is more than two times the size of the Atlantic.

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