Which of the following is the simplest possible hydrocarbon?
A. HC 
CH
B. CH4
C. H2
D. C2H6
E. H2C 
CH2
Answer: B
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A welded igneous texture indicates that
A) there was a lot of gas in the magma. B) the rock cooled quickly. C) the rock broke apart as it flowed. D) the rock cooled slowly. E) the ash and pumice were hot and became compacted.
In these zones, high solar elevation angles occur throughout the year, and this makes ________ consistently warm
A) the tropics B) the prime meridian C) windward sides of mountains D) midlatitudes E) the jet stream
Cigarette smoking is the world's most preventable cause of premature death among adults, resulting in one death every ____ seconds.
A. 5 B. 30 C. 60 D. 120 E. 180
An eruption of a viscous, felsic magma is likely to form a lahar. Indicate whether the statement is true or false