1 .		The climate system involves the exchanges of energy and moisture among Earth's five spheres.   True  False
2 .		During a cycle that takes about 410 years, the tilt of Earth's axis varies between 22.1° and 24.5°.   True  False
3 .		During the geologic past, the movement of Earth's surface plates accounted for many dramatic climate changes.   True  False
4 .		The effect of aerosols in the atmosphere is to absorb additional sunlight.   True  False
5 .		One possible result of additional carbon dioxide in the atmosphere would be to increase the cloud cover which, in turn, would partly offset a global temperature increase.   True  False
6 .		At present, there is great support in the scientific community for the view that explosive volcanism can contribute significantly to an ice age.   True  False
7 .		The change in the shape of Earth's orbit follows a cycle that takes between 90,000 and 100,000 years.   True  False
8 .		The globally averaged surface temperature is projected to increase by 1.4 to 5.8°C by the year 2100.   True  False
9 .		An increase in cloudiness as a result of warmer global temperatures would be an example of a negative climate feedback.   True  False
10 .		A positive-feedback mechanism tends to produce results that are opposite of the initial change and tend to offset it.   True  False