The water vapor-greenhouse feedback represents a ____ feedback mechanism.
a. neutral
b. positive
c. directional
d. negative
e. balanced
Q. 2Changes in incoming solar radiation and in the composition of the atmosphere are two examples of ____ causes of climate change.
a. artificial
b. intrinsic
c. extrinsic
d. internal
e. external
Q. 3Global temperatures probably have not varied by more than ____ during the past 10,000 years.
a. 0.5C
b. 1C
c. 2C
d. 4C
e. 5C
Q. 4The greatest warming experienced over the globe in the last 100 years has occurred in ____.
a. Greenland and the mid-latitude continents in summer and fall
b. the United States in winter and spring
c. parts of Antarctica during the entire year
d. the arctic and over the mid-latitude continents in winter and spring
e. the oceans of the Southern Hemisphere and parts of Antarctica in spring and summer
Q. 5Over the Northern Hemisphere, the period from 1983 to 2012 was likely the warmest 30-year period of the last ____ years, according to the IPCC.
a. 100
b. 300
c. 1,400
d. 2,000
e. 10,000
Q. 6The Viking colony in Greenland perished during the ____.
a. Pleistocene epoch
b. climatic optimum
c. Little Ice Age
d. Younger Dryas
e. Blling-Allerd period
Q. 7During the Little Ice Age, ____.
a. the climatic optimum occurred
b. the Bering land bridge formed
c. alpine glaciers grew in size and advanced
d. continental glaciers covered large portions of North America
e. sea level lowered by about 280 feet
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