2. Alex has a type of rock called calcite, which sometimes glows. He puts the
calcite un...
![subject](/tpl/images/cats/en.png)
2. Alex has a type of rock called calcite, which sometimes glows. He puts the
calcite under a desk lamp but the calcite does not glow. Then he puts it under
an ultraviolet lamp and the calcite glows. Why does ultraviolet light make the
calcite glow when light from the desk lamp does not?
![ansver](/tpl/images/cats/User.png)
Answers: 1
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