Nitrous oxide (N2O) levels have risen about 20% during the last 275 years, mostly because of ____.
A. volcanic eruptions
B. thawing permafrost
C. the increased use of nitrogen fertilizers
D. natural gas power plants
E. ozone-depleting chemicals
Answer: C
Environmental & Atmospheric Sciences
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Mountains are the __________ zone for river systems. See Figure 10.4.
Fill in the blank(s) with the appropriate word(s).
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The ________ is not a part of the Earth's physical environment.
A) hydrosphere B) atmosphere C) astrosphere D) solid Earth
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Which of the following minerals contain single chains of silicon-oxygen tetrahedra in their structure?
a) amphiboles b) feldspars c) olivines d) pyroxenes e) micas (biotite, muscovite, etc.)
Environmental & Atmospheric Sciences
Canada has the world's largest reserve of tar (oil) sands
Indicate whether the statement is true or false
Environmental & Atmospheric Sciences