The blue color of the sky is due to ____
A) selective scattering of visible light by air molecules
B) the filtering effect of water vapor in Earth's atmosphere
C) reflection of sunlight off the Earth's oceans
D) transmission of visible light through the ozone layer in Earth's stratosphere
A
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A portion of the vadose zone in which water occurs only in pore necks and thin layers on particle surfaces is called the:
a. matric zone b. phreatic zone c. funicular zone d. pendular zone
In contrast to the first two agricultural revolutions, the third one originated in the
A) New World. B) Old World. C) core. D) periphery. E) laboratory.
Horizontal pressure changes are ________ than vertical pressure changes
A) greater B) less than C) about the same D) None of the above. There are no horizontal pressure changes.
Water can exist as a liquid at 0°C.
Answer the following statement true (T) or false (F)