Most plants do best in soils with a pH that is
A) below 2.
B) between 6 and 8.
C) between 8 and 10.
D) above 10.
B
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A ________, an area often many kilometers wide that is either uninhabited or sparsely settled, is a zone where no state exercises complete political control
A) frontier B) boundary land (BYL) C) demarcation region (DMR) D) delineation E) demilitarized zone (DMZ)
Halos
A) are most common when the sky is clear. B) require a thin and uniform layer of ice crystals. C) are usually found within five degrees of the Sun. D) occur with the Sun, but not the Moon. E) are caused by reflection of light.
The ocean zone that makes up less than 10% of the world's ocean area, yet contains 90% of all the marine species, is the ____.
A. abyssal zone B. bathyal zone C. benthic zone D. coastal zone E. littoral zone
A red giant has ________
A) a hydrogen-rich core B) high gas pressure C) a helium-rich core D) no outer shell E) an iron-rich core