What makes pearls different from other gemstones like diamonds and rubies?
Where Do Pearls Come From?

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Science
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1st - 6th Grade
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Hard
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
They are always perfectly round.
They are formed by oysters, not geological processes.
They are found only in freshwater.
They are made of pure gold.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What substance do oysters use to coat irritants inside their shells?
Calcium
Nacre
Silica
Salt
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why are pearls considered rare?
Not every oyster makes a pearl, and it takes years to grow.
Pearls are made of diamonds.
Pearls are only found in freshwater.
All oysters produce pearls.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is one reason why pearls can be different in shape and color?
They are painted by humans.
They are affected by the type of water they are in.
They are influenced by the type of nacre used.
They are shaped by the oyster's shell.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How long can it take for a pearl to become large enough for jewelry?
A few hours
Several months
Several years
A few days
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