A study of jet contrails following the grounding of commercial flights after the September 11, 2001 terrorist attacks found that
A) contrails have a very limited effect on the Earth's energy budget.
B) contrails reduce diurnal temperature ranges in regions with a high density aircraft.
C) contrails contribute more to cloud-albedo forcing than cloud-greenhouse forcing.
D) contrails are difficult to distinguish from natural cirrus clouds.
B
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The past 2 million years, which includes our present time, is known to geologists as the:
A) Cambrian Period B) Quaternary Period C) Cenozoic Era D) Mesozoic Era E) Precambrian Period
The cost of natural disasters is ____.?
a. ?increasing steadily each year due to population growth b. ?increasing steadily each year due to economic growth c. ?variable from year to year due to the unpredictability of natural disasters and their effects d. ?increasing steadily each year due to population and economic growth e. ?decreasing steadily each year due to improved forecasting and public awareness
More than half of the animal species, marine and terrestrial, are not considered to be free-living
Indicate whether the statement is true or false
The apparent westward drift of the planets as compared to the background stars is called ________ motion
Fill in the blank(s) with correct word