The oldest known continental crust is ___________ years old. What will be an ideal response?
3.96 billion
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One of the major environmental hazards of heap leach mining is the use of cyanide for gold extraction
Indicate whether the statement is true or false
Which parcel of air is the most humid?
a. temperature 72?F, dew point 70?F b. temperature 72?F, dew point 68?F c. temperature 72?F, dew point 65?F d. temperature 72?F, dew point 60?F
Which of the following vertical zones of a large coral reef has light intensity of about 60% of the surface intensity?
A) From a few centimeters to a few meters B) From a few meters to 20 meters C) From 20 meters to 50 meters D) From 50 meters to 150 meters E) Below 150 meters
Where are active dissolution processes rarely found?
A. rainforests B. humid climates C. low elevations D. arid climates E. wetlands