A rock that is 375 million years old comes from the ________ Period
A) Tertiary
B) Permian
C) Cretaceous
D) Devonian
Answer: D
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A. a magnetic field. B. an electric field. C. both of these D. neither of these
Clouds that refract sunlight or moonlight and take on bright violet, green, and pink colors are called:
A) coronal clouds. B) iridescent clouds. C) sprites. D) the glory.
Which of the following best describes the components of phospholipids?
A) glycerol, one fatty acid, two phosphate groups, and an alcohol B) glycerol, two fatty acids, a phosphate group, and an alcohol C) either of these, depending on the identity of the phospholipid D) none of the above
If a 100-year floodplain was flooded in 2003, when should we expect the next 100-year flood?
a. ?2013 b. ?2053 c. ?2103 d. ?2104 e. ?at any time