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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Indicate whether the statement is true or false

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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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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

The ________ is not a part of the Earth's physical environment.

A) hydrosphere B) atmosphere C) astrosphere D) solid Earth

Environmental & Atmospheric Sciences