Atmospheric prevents most gamma ray, x-ray, ultraviolet, and infrared light from reaching the surface of earth.
a. opacity
b. turbulence
c. weather
d. temperature
e. none of the above

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there is no universally accepted definition of art. although commonly used to describe something of beauty, or a skill which produces an aesthetic result, there is no clear line in principle between (say) a unique piece of handmade sculpture, and a mass-produced but visually attractive item. we might say that art requires thought - some kind of creative impulse - but this raises more questions: for example, how much thought is required? if someone flings paint at a canvas, hoping by this action to create a work of art, does the result automatically constitute art?

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