In which of the following conditions does exhaled breath condense?
A. It is very warm and dry.
B. The addition of water vapour from your breath causes the air's relative humidity to decrease
C. It is very cold.
D. The addition of water vapour from your breath causes the air's specific humidity to exceed 5g/kg.
Answer: C
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Well before the start of European colonialism, Europe had already
A) cut down most of its forests. B) established a strong record of environmental preservation. C) doubled its area by reclaiming land from the sea. D) polluted its air, water and soils through industrialization. E) identified the relationship between human actions and global warming.
Tropical winds generally blow in which direction in both hemispheres?
A) from east to west B) from south to north C) from north to south D) from west to east E) there are no prevailing wind directions in the tropics
Howie lets a dart swing against an upright block of wood. The greatest force of impact on the block occurs when the dart
A. glances off to the side. B. bounces. C. sticks. D. none of the above
When Columbus sailed to the New World, he primarily took advantage of
A) polar easterlies. B) midlatitude westerlies. C) northeasterly trades. D) southeasterly trades. E) none of the above