The third-most abundant gas in Earth's atmosphere (not including water vapor) is
A) oxygen.
B) argon.
C) nitrogen.
D) carbon dioxide.
E) helium.
B
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Pioneer farmers settling the grasslands of the American West often built houses of sod, while early settlers of the eastern forest built wooden structures like log cabins. This suggests that building materials
A) are strongly influenced by local resources.
B) are commonly imported over long distances because of local folk culture.
C) are chosen because of the diffusion of popular culture.
D) are a uniform feature of folk culture.
E) are elements of popular culture.
The plastic layer in the mantle from about 70 to 250 km (43 to 155 mi) in depth is known as the
A) asthenosphere. B) lithosphere. C) Moho. D) Gutenberg discontinuity.
The horizontal movement of air is called ________
Fill in the blank(s) with correct word
The ________ the tilt of the earth, the smaller the temperature difference between summer and winter
Fill in the blank(s) with correct word