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What Happens to a Lost Balloon?
What Happens to a Lost Balloon? The toy balloon sold at fairs that tugs on the end of a string is filled with a…
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…
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
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…
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…