The percentages of various gases in the atmosphere indicate that the composition of the atmosphere is controlled
A) totally by the amount and type of gases given off during volcanic eruptions.
B) totally by the composition of comets and meteors that strike Earth.
C) to a significant extent by biological processes occurring on Earth.
D) exclusively by chemical reactions between sunlight and the gases in the atmosphere.
C
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Modern geographers tend to reject environmental determinism in favor of possibilism in explaining relationships between human activity and the physical environment
Indicate whether the statement is true or false.
At approximately which latitudes do air masses sink?
A) ?0° and 45° N&S B) ?0° and 60° N&S C) ?30° N&S and 90° N&S D) ?30° N&S and 60° N&S
The Earth's axial tilt varies from 21.5° to 24.5° during a 41,000 year period
Indicate whether the statement is true or false
At night, low clouds weaken the atmospheric greenhouse effect
a. True b. False