In Copernicus' model of the solar system, the planets orbited the ________ in ________ orbits.
A. Sun; elliptical
B. Sun; circular
C. Earth; circular
D. Earth; elliptical
Answer: B
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A green flash occurs because:
A) ice crystals diffract the green light. B) green light is scattered more during sunrise. C) green light is bent more than red and orange light. D) red and orange light is absorbed by the atmosphere.
Of the regions below, which was the initial one that went through stage three of the demographic transition?
A) Africa B) Asia C) Europe D) Middle East E) South America
Groundwater eventually returns to the atmosphere through which of the following?
A) seepage into rivers B) human use in agriculture and industry C) transpiration through plants D) all of the above
Tall grasses with a few scattered, drought-resistant trees describes a(n) _______________ . (two words)
Fill in the blank(s) with correct word