One of the environmental problems with gold mining is the leach ponds that contain ____________________
Fill in the blanks with correct word
cyanide
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What does a profile of a river from its headwaters to its mouth typically show?
A) An increase in gradient downstream B) A straight-line profile reflecting a constant decrease in gradient C) An abrupt increase followed by a gradual decrease D) A curved shape that flattens out downstream E) None of these are correct.
About how often does a natural stream overflow its banks?
What will be an ideal response?
What is the leading source of renewable energy worldwide?
A. hydropower B. geothermal energy C. solar-cells D. biomass E. biodiesel
The Norwegian Vikings began looking westward after French, Irish, and British strengthened their
defenses against their raids Indicate whether the statement is true or false.