Which energy source used to run an automobile produces the least amount of harmful emissions?

A. hydrogen
B. methane
C. natural gas
D. gasoline


Answer: A

Environmental & Atmospheric Sciences

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describing how the Earth acts as a system with subsystems. What are these subsystems and how do they interact? What will be an ideal response?

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Hunters and gatherers, or foragers, did not modify their landscapes

a. True b. False Indicate whether the statement is true or false

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Which of the following countries has the lowest population growth rate?

A. China B. India C. Brazil D. Russia

Environmental & Atmospheric Sciences

Which term refers to the number of people per unit of arable land?

A. agrodensity B. physiological density C. antidensity D. arithmetic density

Environmental & Atmospheric Sciences