Why Do Pine Trees Stay Green All Year?
Why Do Pine Trees Stay Green All Year? Pine trees remain green throughout the year because they don’t lose all their leaves at one time. Trees that remain green...
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Why Do Drops of Moisture Form on a Cold Glass?
Why Do Drops of Moisture Form on a Cold Glass? The beads of moisture that form on a glass of ice-cold water on a warm day have nothing to do with the liquid inside the...
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Where Do Insects Go in Winter?
Where Do Insects Go in Winter? In parts of the world where winters are cold, most insects die at summers end. But they leave many eggs to hatch in the spring. Some...
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When Was Hoover Dam Built?
When Was Hoover Dam Built? Once known as Boulder Dam, Hoover Dam is a concrete arch-gravity dam across the Black Canyon of the Colorado River between the states of...
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How Is Glass Made?
Ordinary glass is made from clean, white sand and two white, powdery chemicals known as soda and lime. Just plain sand can be made into glass, but it must be heated to...
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