During clear sky conditions, the sky is normally blue in the middle of the day, and some combination of red, yellow and orange at sunrise and sunset. This suggests that
A) the sun is close to perihelion.
B) atmospheric path length is related to sky color.
C) the date is close to one of the solstices.
D) the date is close to one of the equinoxes.
Answer: B
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Keystone species have a large effect on the types and abundances of other species in an ecosystem.
Answer the following statement true (T) or false (F)
Several historians speculate that the bubonic plague caused Europe to change from
A) an unsanitary society to a sanitary society, especially in central Europe. B) a credit-rich economy to a cash-poor economy. C) being a rural region to an urbanized region. D) being an urbanized region to a rural region. E) a land-poor, people-rich to a people-poor, land-rich group of societies.
The thermopause is located
A) wherever -90°C (-130°F) is recorded. B) approximately 480 km (300 mi.) above Earth's surface. C) between the mesosphere and the thermosphere. D) at the bottom of the homosphere.
If the glacial budget is balanced (accumulation equals wastage), then ________
A) the ice front will advance B) the terminus of the glacier is stationary C) the glacier will not flow downhill D) the ice front will retreat