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Pramila Pramila
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6 years ago
Which of the following is NOT a problem that has been often caused by placer mining?
A) poisoning rivers with hydrogen sulphide
B) poisoning rivers with mercury
C) poisoning rivers with cyanide
D) polluting water with large amounts of suspended debris
E) causing erosion
Textbook 
Environment: The Science Behind the Stories, Canadian Edition

Environment: The Science Behind the Stories, Canadian Edition


Edition: 3rd
Authors:
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RohcodomRohcodom
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6 years ago
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Pramila Author
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6 years ago
Thanks
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Yesterday
You make an excellent tutor!
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2 hours ago
Helped a lot
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