A cloud of interstellar gas is held together by
A. the gravitational force.
B. electromagnetism.
C. infrared radiation.
D. All of the above.
Answer: A
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If industry managers ask the question "How can my company avoid producing polluting air exhaust from my factory?" they are seeking pollution prevent, which is preferable to pollution cleanup
Indicate whether the statement is true or false
Air resistance acting on a fast-moving football shortens its
A. maximum height. B. range. C. both of these D. none of the above
Why did multinational corporations establish offices in Johannesburg, then leave, and now have returned?
A. They came for the mining, left when the mines were no longer viable, returned as service industries developed. B. They came for low-cost labor, left because of the HIV epidemic, returned when the epidemic was under control. C. They came for diamonds, left because the currency collapsed, returned when white minority rule ended. D. They came for mining, left because of apartheid, returned when apartheid ended.
On an ordinary day, a volume of air about the size of your index finger contains between ____ and ____ particles
a. ?1; 150 b. ?10; 1,500 c. ?100; 15,000 d. ?1,000; 150,000 e. ?10,000; 1,500,000