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fresh water pearls Why is the fresh water Kentucky’s state gem?

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Presentation on theme: "fresh water pearls Why is the fresh water Kentucky’s state gem?"— Presentation transcript:

1 fresh water pearls Why is the fresh water Kentucky’s state gem?
By: Gavin F. and Sebastian F.

2 How long does it take to make a pearl?
It usually takes 2-3 years for a pearl to cultivate , but a lot of pollution has decreased the number of pearls greatly so pearls are cultivated through man-made process.

3 What are fresh water pearls?
Pearls are deposits of calcium carbonate called nacre. Pearl is not a mineral because it does not have a distinctive crystal structure and is formed by the action of a living thing.

4 Where were fresh water pearls found?
Pearls were found in 1986 along the Mississippi and Tennessee River valleys.

5 How do pearls form? Pearls form around irritants(usually sand grains) in mussels, oysters, and clams.

6 Fresh water pictures


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