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ZanzabumX [31]
3 years ago
14

How are placer mining, hydraulic mining, and hard-rock mining different?

History
2 answers:
Vinvika [58]3 years ago
4 0
These are different because the way the rock is worked differs, as well as the type of rock.
Delicious77 [7]3 years ago
3 0

Answer:

placer mining , hydraulic mining method od mining that uses water under high pressure to blast away gravel and dirt to expose the minerals underneath.

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A moth lays 500 or so eggs and then dies

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Why it was valuable to the Chinese
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Silk cloth was extremely valuable in Ancient China. Wearing silk was an important status symbol. At first, only members of the royal family were allowed to wear silk. Later, silk clothing was restricted to only the noble class. Merchants and peasants were not allowed to wear silk. Silk was even used as money during some Ancient Chinese dynasties.

Why it was secret
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Silk became a prized export for the Chinese. Nobles and kings of foreign lands desired silk and would pay high prices for the cloth. The emperors of China wanted to keep the process for making silk a secret. Anyone caught telling the secret or taking silkworms out of China was put to death.


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