Review Question 1. When is the subsolar point directly over 20 °N latitude? A) Never B) Between the summer solstice and the fall equinox C) Between the spring equinox and the summer solstice D) B and C. Review Question 2. Why is Pluto no longer considered a planet? A) Because it is square
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Chapter 3Earth’s Modern Atmosphere
An Introduction to Physical Geography
Robert W. Christopherson
Nitrogen (~78% of vol.)
Oxygen (~21% of vol.)
Argon (~1% of vol.)
Water vapor (0-4% of vol.)
Carbon dioxide (0.037% of vol.)
Ozone (0.000007% of vol.)
Methane (0.00017% of vol.)
Composition of the Atmosphere
The steady increase of atmospheric CO2.
Question: the seasonal variation?
Human acitivities release 7.1 GtC/yr (gigatons of Carbon per year).
2 GtC/yr absorbed by oceans.
1.9 GtC unaccounted for.
3.2 GtC remain in atmosphere.