What produces the acidic pH of some mine runoff?

A. Metal ores are reduced by exposure to the atmosphere.
B. Metal ores are oxidized by exposure to the atmosphere.
C. microbial activity
D. Sulfur-containing ores are reduced by exposure to oxygen.
E. both oxidation of metal ores and microbial activity


Answer: E

Biology & Microbiology

You might also like to view...

Cancer can be considered an inherited disease if ____________________

a. at least one mutation is inherited b. a family member has some type of cancer c. all members of the family share the same gene d. a person inherits a tumor suppressor gene from one of his parents

Biology & Microbiology

Which of the following is formed last in the transfer

of solar energy? a. H+ b. excited electrons c. ATP d. O2 e. NADPH

Biology & Microbiology

What is an advantage of closed circulatory systems?

What will be an ideal response?

Biology & Microbiology

Which has the greatest albedo? Grassland, forest, asphalt, or sea ice?

What will be an ideal response?

Biology & Microbiology