A polar air mass moving south from Canada may pick up from the Mississippi basin more than nine times as much water as flows out from the mouth of the river.
A rainbow can be seen only in the morning or late afternoon. It is a phenomenon that can occur only when the sun is 40 degrees or less above the horizon.
A saguaro can top 60 feet, and may live 300 years.
A single orchid plant of the genus Cymbidium was sold in the United States in 1952 for $4,500.
A sizable oak tree, during the typical growing season, gives off 28,000 gallons of moisture.
A soldier would wear a "havelock" on his head in the desert. It's a light cloth covering, attached to a military cap that protects the back of a soldier's neck from the sun. It was named for Sir Henry Havelock, a British officer serving in England.
A standard garden hose can put out as much as 20 gallons of water per minute. A hose left on by mistake can waste as much as 28,000 gallons in just 24 hours.
A thousand tons of meteor dust fall to Earth every day.
A wind farm at Altamont Pass, California, consists of 300 wind turbines. To produce as much electricity as a nuclear power station, a wind farm would need to occupy an area of approximately 140 square miles.
About 110,000 million tons of carbon dioxide enter the atmosphere each year as the result of burning fossil fuels. Removing this amount of carbon dioxide from the atmosphere requires a forested area the size of Australia.
About 2 billion tons of animal manure are produced in the U.S. every year. France, Holland and Belgium have been classified by the European Community as "manure surplus" regions because they produce more than their land can absorb
About 5.6 percent of Earth’s crust is composed of iron.
About half of the energy entering the outer atmosphere from the sun reaches the ground. Of the radiation that reached the ground, about one-third is radiated back into space, one-third heats the lower atmosphere, and one-third is used in the process of evaporating water.
According to experts, large caves tend to "breathe"; they inhale and exhale great quantities of air when the barometric pressure on the surface changes, and air rushes in or out seeking equilibrium.
According to international definition, fog occurs when visibility is 600 feet or less. Visibility in mist may extend up to 3,000 feet.
According to NASA, the U.S. has the world's most violent weather. In a typical year, the U.S. can expect some 10,000 violent thunderstorms, 5,000 floods, 1,000 tornadoes, and several hurricanes.
According to one study, plant and animal species are becoming extinct at the rate of 17 per hour.
According to Professor Walter Connor of the University of Michigan, men are six times more likely than women to be struck by lightning.
According to weather forecast experts, here is a rule of thumb for weather forecasting: winds from the northwest, west, and southwest usually indicate fair weather for a time, whereas winds from the northeast, east, and south predict unsettled weather.
Acorns are poisonous to humans, and, if eaten, will cause kidney damage.
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