Plane and Simple
A boy who is three feet tall puts a nail into a tree at his exact height. He returns two years later when he has grown by six inches and th
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Years
Where Does Coal Come From?
Coal comes from the remains of trees, shrubs, and plants that grew millions of years ago, in tropical wetlands, such as those of the…
When Were the Ice Ages?
The Ice Ages ended about 10,000 years ago after lasting about two million years. At its greatest extent the ice covered nearly 30 per…
Is the Moon Moving Farther Away from Earth?
As the Moon travels around Earth, it affects Earth’s rotation. Scientists have determined that the Moon slowly gets farther away from Earth at the…
When Do People Stop Growing?
When Do People Stop Growing? People stop growing when their bones do, and that is usually between 15 and 25 years of age. Bones are made up