Which of the following terms refers to rain that falls from a cloud and evaporates before reaching the ground?
A. graupel
B. dry rain
C. sleet
D. virga
Answer: D
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Your book states that a "sewage treatment plant removes 70% of the phosphorus and 50% of the nitrogen that flows through it". According to the Law of Conservation of Matter, there is no detectable increase or decrease in the quantity of matter during an ordinary chemical change. Assuming that only ordinary chemical changes occur in sewage treatment plants, how is the nitrogen removed?
A. denitrification B. nitrogen fixation C. biodegradation D. combustion
An interrelated collection of plants and animals and the physical environment with which they react is a(n)
A) biome. B) ecosystem. C) biomass. D) biosphere.
Which of the following amino acids will exist as a -2 ion at very high pH?
A) arginine B) glutamic acid C) isoleucine D) none of these
Mineral crystals may exhibit ________ with a specific cation in the center and a different cation on its rim.
A. cleavage B. double refraction C. polymorphism D. compositional zoning