Energy from the sun reaches Earth through ________
A. conduction
B. gravity
C. convection
D. radiation
Ans: D. radiation
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Which of these hazardous chemicals is polluting waterways in Central and South America due to small-scale gold mining practices?
A. mercury B. cyanide C. arsenic D. chromium
Which type of radiation from cosmic sources predominates on the inside of a high-flying commercial airplane: alpha, beta, or gamma?
A. alpha radiation B. gamma radiation C. beta radiation D. None of these predominate as all three are abundant.
Many proponents of sustainability believe that encouraging local self?sufficiency is important for building sustainable societies because ________
A) when people are tied more closely to the area they live in, they will value the area more and seek to sustain its environment and its human communities B) this is not correct; proponents of sustainability believe that encouraging local self?sufficiency will pose a threat to building sustainable societies C) it forces citizens to look more closely at the global community D) it eliminates governmental influence on local practices E) more and more people are growing gardens
What is meant by the habitable zone in other solar systems?
A. A narrow zone around a star where liquid water can exist B. A zone defined by abundant sunlight C. A zone with abundant plant growth D. A zone where oxygen is present