Recent studies indicate that two of the most dangerous components of air pollution in and around major cities in the United States are
A) fine particles and sulfur pollution.
B) carbon monoxide and ozone.
C) lead and volatile organic compounds.
D) radon and carbon monoxide.
A
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To avoid a decline in prices for some minerals, producing countries have occasionally joined together in cartels—organizations that agree to control and limit production
Indicate whether the statement is true or false.
Sand dunes are most likely formed in a wet tropical environment
a. True b. False
Geomagnetic reversals________________________
a) provided strong evidence for seafloor spreading b) caused all the mass extinctions in recorded geologic history c) destroyed compasses ane electronic equipments d) confirmed the existence of subduction zones e) cause the movements of plates
Who was the first person to suggest that all of the continents had been once joined together as a
supercontinent called Pangaea and when was that idea proposed? What will be an ideal response?