During the process by which energy is produced inside of stars
A) hydrogen is fused together to form helium.
B) helium is fused together to form hydrogen.
C) hydrogen splits to form helium.
D) helium splits to form hydrogen.
Ans: A) hydrogen is fused together to form helium.
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According to the following reaction, which molecule is acting as an acid? H3O+ + HSO4- ? H2O + H2SO4
A) H2SO4 B) H2O C) H3O+ D) HSO4- E) none of the above
The relative contribution of common gases in the atmosphere increase as a percentage of the greenhouse effect in which of the following going from lowest to highest percentage?
A. carbon dioxide; methane; CFC-11; CFC-12 B. methane; CFC-11; CFC-12; carbon dioxide C. methane; carbon dioxide; CFC-11; CFC-12 D. CFC-11; CFC-12; carbon dioxide; methane E. CFC-12; CFC-11; methane; carbon dioxide
Auroras are associated with massive bursts of solar wind called coronal mass ejections
Indicate whether the statement is true or false
Which climate supports little or no agriculture?
a. mediterranean summer--dry b. midlatitude steppe c. tropical and subtropical steppe d. tropical and subtropical desert e. complex mountain