Which of the following pairs of reagents is now used industrially to synthesize PET poly(ethylene terephthalate)?
A) ethylene and dimethyl terephthalate
B) ethylene glycol and dimethyl terephthalate
C) ethylene and terephthalic acid
D) ethylene glycol and terephthalic acid
B
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India once planted 30,000 varieties of rice; now most of the rice comes from how many varieties?
A. 10 B. 50 C. 100 D. 500 E. 2,500
What would fossil ages from the geologic timescale and an isotopic age on the granite tell us about the age of the unconformity?
A. It is not possible to have fossils preserved so close to granite. B. The unconformity is older than the age assigned to the fossils. C. The granite is younger than the unconformity. D. The unconformity is older than the isotopic age of the granite. E. None of these choices are correct.
The Tippecanoe Sequence of North America is an example of a major cratonic sequence. Indicate whether the statement is true or false
Most of the weather happens in the ________.
A. troposphere B. atmosphere C. stratosphere D. mesosphere E. thermosphere