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How Does a Magnifying Glass Work?
How Does a Magnifying Glass Work? A magnifying glass makes the words and letters on a page look much larger because of the way…
What Causes Rain?
What Causes Rain? You know that rain falls from clouds. Water is constantly evaporated from the earth's surface by the warmth of the sun.…
What Is a Sand Dollar?
What Is a Sand Dollar? Have you ever taken a walk along the beach to collect seashells and found a gray disk shaped like…
How Is Coal Formed?
How Is Coal Formed? Coal comes from plants that have been buried in the earth so long, they turned hard and black. Millions of…
What Is a Hologram?
A hologram is a physical structure that diffracts light into an image. The term ‘hologram’ can refer to both the encoded material and th