Where Do Teeth Come From?
Teeth are formed from specialized cells which produce the three parts of the tooth—root, neck, and crown. The outer coating of the crown is…
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Primary
What Is Clay?
Clay is a special kind of earth. It is made up of the smallest particles of rock, tinier than those in most other kinds of soil. The mineral
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