What Makes a Fire Smoke?
What Makes a Fire Smoke? The smoke that rises from a chimney or a bonfire is made chiefly of gases that are produced when the fuel burns. Most of the gases in wood...
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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 Makes Geysers?
Geysers are steam explosions of a spring from which water and steam is ejected forcefully into the air at heights ranging from less than a few feet to over several...
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Why Do Leaves Turn Brown in the Fall?
Why Do Leaves Turn Brown in the Fall? The leaves of trees turn brown in autumn when they lose a green substance called chlorophyll. All spring and summer the leaves on...
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Why Are Piranha Fish so Dangerous?
Why Are Piranha Fish so Dangerous? In South American Rivers swims one of the world’s most dangerous fish – the piranha. There are many species of piranha; they...
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