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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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 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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