On the graphs shown, you can identify an ice age by looking for __________.
A. a trough (bottom of a dip) on the temperature graph
B. a peak on the temperature graph
C. a trough (bottom of a dip) on the carbon dioxide graph
D. a place on the temperature graph where the temperature curve falls steeply
Answer: A. a trough (bottom of a dip) on the temperature graph
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A thermos bottle works well because:
A. its glass walls are thin B. silvering reduces convection C. vacuum reduces heat radiation D. silver coating is a poor heat conductor E. none of the above
The second postulate of special relativity states that the speed of light, when measured in a vacuum, is constant for all observers
a. True b. False Indicate whether the statement is true or false
On the moon, the maria have fewer craters than the highlands
Indicate whether the statement is true or false
Interstellar gas is composed of:
A) only hydrogen. B) 90% hydrogen, 9% helium by weight. C) 10% hydrogen, 90% helium by numbers of atoms. D) some hydrogen, but mainly carbon dioxide. E) ammonia, methane, and water vapor.