How Do We Hear Sounds?
How Do We Hear Sounds? When sounds are made, they set up movements in the air. These movements are called sound waves. The cup-like shape of the outer ear collects the...
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What Causes an Echo?
What Causes an Echo? An echo occurs when sound bounces back from an object. When we speak or shout, sound waves travel through the air. We first hear the sound when the...
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Is a Turtle the Same as a Tortoise?
Is a Turtle the Same as a Tortoise? Yes. A turtle is the same as a tortoise. There is some confusion over the name of this familiar reptile. Often it is...
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How Many Dog Years Equal One Human Year?
How Many Dog Years Equal One Human Year? The first two years of a dog’s life equal about the first 24 years of a human’s life. After that, each year of a...
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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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How Do Plants Give off Oxygen?
How Do Plants Give off Oxygen? Plants give off oxygen during the process of photosynthesis. Using green chlorophyll (which gives them their color), the leaves of plants...
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What Is Amber?
Amber is the fossil resin of ancient pine trees. On hot, prehistoric days, sticky pine resin oozed from trees and hardened in the air filling internal fissures,...
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What Causes a Rainbow?
What Causes a Rainbow? After a shower of rain there is often a rainbow. Rainbows form when the sun begins to shine through the clouds while the air is still filled with...
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Why Does the Highway Look Wet on a Hot Day?
Why Does the Highway Look Wet on a Hot Day? On a summer day you may have noticed a pool of water ahead of you in the road. When you get closer, the pool of water...
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How Many Peanuts Does It Take to Make a Jar of Peanut Butter?
How Many Peanuts Does It Take to Make a Jar of Peanut Butter? The National Peanut Board estimates it takes about 540 peanuts to make a 12-ounce jar of peanut butter....
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