Carbon dioxide in the atmosphere
A. reduces the amount of the sun's energy reaching Earth.
B. reduces the amount of energy leaving Earth.
C. reduces the amount of ultraviolet radiation reaching Earth.
D. All of these statements are correct.
E. None of these statements is correct.
Answer: B
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Variations in regional unemployment provide a measure of labor mobility because workers can normally be expected to move from areas of high unemployment to areas of low unemployment
Indicate whether the statement is true or false.
If the crustal abundance of some substance is 5% and a "good" ore deposit contains 25%, what is the concentration factor needed to economically mine this substance?
a. 0.20 b. 1 c. 2 d. 5 e. 25
The Modern Era's views on the relationship of humans and the environment can be described as ________
A) opportunities for fewer connections between humans and nature B) human impacts on ecosystems differ significantly from natural disturbances C) reconciliation of our activities with the inescapable laws of the natural world D) evolutionary change that described the connections between organisms and their environment E) the obsession with material goods that broke the connection between humans and nature
GIS data are usually illustrated by_____________________.
-maps -websites -spreadsheets -coordinates -the USGS