Astronauts deployed a solar wind measuring experiment on the Moon because
A) the lunar surface is protected by an atmosphere.
B) there is no electromagnetic energy arriving there.
C) the solar wind does not reach the Earth's surface.
D) no one else had attempted the experiment before and they wanted to be the first.
C
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Arguing that trees should be cut so long as the forest remains is what kind of approach?
A) preservation B) wilderness C) conservation D) unsustainable E) biodiverse
Which example illustrates a negative feedback loop?
A. melting polar ice B. exponential population growth C. a thermostat maintaining a certain temperature in your house D. the greenhouse effect E. vegetation removed from a stream valley
What is the average diameter of the head of a comet?
a. ?1-2 km b. ?less than 15 km c. ?50 km d. ?500 km e. ?2,500 km
What pH value indicates a strong acid?
a. 12.5 b. 9.1 c. 3.5 d. 1.7