What Causes the Common Cold?
What Causes the Common Cold? Common colds are caused by tiny organisms called viruses, which infect the mucous membranes of the nose and throat. These viruses are...
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What Are Sun Dogs and How Do They Form?
What Are Sun Dogs and How Do They Form? The bright, colored areas of light beside the Sun are known as sun dogs (sundogs). They’re often approximately 22 degrees...
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What Keeps an Igloo Warm Inside?
What Keeps an Igloo Warm Inside? If you were an Eskimo living in the far north of Canada, you might build your winter house from blocks of snow and sleep on a bed of...
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How Does Dew Form?
How Does Dew Form? On clear summer mornings the grass is often wet with dew. Dew is liquid water droplets that form on grass, spider webs and other things in the early...
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How Are Bubbles Put into Soda Pop?
How Are Bubbles Put into Soda Pop? The bubbles in your favorite soft drink are made by a colorless, tasteless gas called carbon dioxide. This bubbly gas gives soda its...
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