Why Were Covered Bridges Built?
Why Were Covered Bridges Built? A covered bridge is a timber-truss bridge with a roof and siding which, in most covered bridges, create an almost complete enclosure....
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Is Breathing Cold Air Dangerous?
Breathing cold air isn’t dangerous. Your body has special mechanisms in place to make sure that all the air that reaches your lungs is plenty warm and full of...
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Why Do Leaves Turn Colors in the Fall?
Why Do Leaves Turn Colors in the Fall? The green we see in leaves all summer comes from the green pigment “chlorophyll,” which leaves use in making food. Other colors...
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What Is a Cold-blooded Animal?
What Is a Cold-blooded Animal? Many animals such as fish, frogs, snakes and lizards are often called “cold-blooded,” as opposed to “warm-blooded” mammals and birds....
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What Causes the Ocean Tides?
What Causes the Ocean Tides? The rise and fall of the tides are caused mainly by the pull of gravity from the moon on the earth’s waters. The moon pulls up the...
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