What Causes Rain?
What Causes Rain? You know that rain falls from clouds. Water is constantly evaporated from the earth’s surface by the warmth of the sun. The invisible water...
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What Causes a Mirage?
What Causes a Mirage? Desert travelers often tell of seeing distant pools of water, only to have the water disappear when they drew near. Those vanishing images are...
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What Are Clouds Made Of?
Clouds are made up of very tiny drops of water or tiny crystals of ice that float in the air. Clouds form when warm air, containing moisture evaporated from the...
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How Does a Refrigerator Work?
How Does a Refrigerator Work? Earlier food was preserved by traditional methods like salting and pickling which were not always practical. Nowadays refrigerators are...
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What Are Sunspots?
Sunspots are dark, relatively cool spots on the surface of the sun in a region called the photosphere. Sunspots have temperatures of about 3,800 degrees K. They can be...
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