Why does the Moon have a layer of powdery "soil" on its surface?
A) Large impacts shattered lunar rock to make this soil.
B) The soil exists because the Moon accreted from powdery material after a giant impact blasted Earth.
C) Volatiles escaping from the Moon's interior bubble upward and make the soil.
D) The soil is the result of the same processes that make powdery sand on Earth.
E) It's the result of gradual erosion by micrometeorites striking the Moon.
E
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Rub electrons from your hair with a comb and the comb becomes
A) negatively charged. B) positively charged. C) discharged.
Photons of light can be absorbed by an atom of an element ____
a. if they match one of several possible wavelengths that are absorbed by that element b. if they match one of several possible wavelengths that are absorbed by all elements c. if they match the only particular wavelength that can be absorbed by that element d. if they match the only particular wavelength that can be absorbed by all elements e. no matter what wavelength they have
The rings of Neptune:
A) were confirmed by the Voyager 2 in 1989. B) number five, with three narrow, two more diffuse. C) all lie within Neptune's Roche Limit. D) often appear as clumpy ring arcs, rather than complete and symmetrical. E) All of these are correct.
The figure shows the position of an object as a function of time, with all numbers accurate to two significant figures. Between time and time (a) what is the average speed of the object? (b) what is the average velocity of the object?
What will be an ideal response?