What Is a Light-year?
What Is a Light-year? Space is so vast that scientists don’t use miles to measure how far stars are away from us. The number of miles would be too large to work...
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What Is an Iceberg?
What Is an Iceberg? If a glacier reaches the sea, its forward edge breaks off, forming huge floating blocks of ice called icebergs. Icebergs are pieces of ice formed on...
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How Deep Is the Deepest Spot in the Ocean?
How Deep Is the Deepest Spot in the Ocean? Off the island of Guam in the Pacific Ocean is a very deep, crescent-shaped trench called the “Mariana Trench.” Near the...
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Why Do Fish Swim in Schools or Shoals?
Why Do Fish Swim in Schools or Shoals? Some fish swim alone; others stay in groups known as “schools” or “shoals”. A school of fish swims in formation, moving and...
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Why Is the United States Called Uncle Sam?
Uncle Sam, popular symbol for the United States, usually associated with a cartoon figure having long white hair and chin whiskers and dressed in a swallow-tailed coat,...
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How Does a Prism Produce Colors?
How Does a Prism Produce Colors? A prism is a piece of glass or other see-through material that has several flat sides, called faces. Many prisms have three long faces...
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How Is Sound Produced?
How Is Sound Produced? Sounds travel in waves. If you throw a pebble into a still pond, you will see ripples, or waves, spread outward from the point where the pebble...
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Why Do Leaves Change Colors in Autumn?
Why Do Leaves Change Colors in Autumn? In autumn, the leaves of many trees turn from green to shades of scarlet, gold, orange, and purple. Jack Frost is usually given...
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Why Do Owls Hoot?
Why Do Owls Hoot? Owls make these sounds in order to communicate. And there are just as many messages as there are different types of calls. The exact message conveyed...
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How Does a Ventriloquist Make His Dummy Talk?
How Does a Ventriloquist Make His Dummy Talk? People who can make their voices seem to come from somewhere away from themselves are called “ventriloquists.”...
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