Mars is best viewed from Earth when it is at:
A) perihelion.
B) opposition.
C) conjunction.
D) aphelion.
E) None of the above.
B
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Which statement best describes the greenhouse effect? a. infrared radiation escapes into space
b. ultraviolet radiation enters a planet's atmosphere producing a green haze c. visible radiation is trapped by the atmosphere. d. infrared radiation is trapped by the atmosphere. e. oxygen escapes from the atmosphere.
What is spacetime?
A) It's the inseparable combination of space and time. B) It's time that we measure when traveling in space. C) It's a graph with four axes. D) It's a way of viewing books at different angles.
A new Moon appears in the sky just before the time of a
A) solar eclipse. B) lunar eclipse. C) both of these D) neither of these
The density of air at room temperature is about 1.2 g/cm3. This is the same as
A) 12 kg/m3. B) 120 kg/m3. C) 1200 kg/m3.