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Red Beryl is located in only four separate locations, because the conditions required to form it, is extremely specific. Only four documented volcanos, located in the United States, Mexico, Russia, and Mongolia, have lava rich in topaz rhyolite, a key component for the formation of Rede Beryl. Without the lava rich in topaz rhyolite, Red Beryl isn't capable of forming. This is the reason that only four places in the world, are capable of producing any Red Beryl.

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Explanation:

the minoan civilization flourished in the middle bronze age on the island of crete located in the eastern mediterranean from c. 2000 bce until c. 1500 bce. with their unique art and architecture, and the spread of their ideas through contact with other cultures across the aegean, the minoans made a significant contribution to the development of western european civilization as it is known today. labyrinth-like palace complexes, vivid frescoes depicting scenes such as bull-leaping and processions, fine gold jewelry, elegant stone vases, and pottery with vibrant decorations of marine life are all particular features of minoan crete.  

so basically their unique way of ding arts, as well as architecture.

b) to encourage free trade