Globally, 80% of all infectious diseases are caused by ________
A) water-borne diarrheal pathogens
B) avian and swine influenza viruses
C) HIV/AIDS
D) tick-borne pathogens
E) mosquito-borne pathogens
A
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The sunspots produce huge ejections of particles that:
A) accelerate the melting of ice sheets. B) produce auroras in Earth's atmosphere. C) rapidly increase the temperature at the surface of Earth. D) do not generally interact with the Earth system.
Weather radar systems are mainly designed to produce images of:
a. wind speed and directions on clear days as well as stormy days. b. precipitation patterns and amounts by seeing through clouds. c. temperature patterns in the atmosphere. d. All of these.
The average insolation received by the thermopause when Earth is at its average distance from the sun is known as the
A) solar constant. B) energy balance. C) incoming solar radiation. D) solar wind input to the atmosphere.
A band of deserts rings the Earth at about 30° north and 30° south latitude because these are regions of
A. Air that cools as it descends B. The earth's most intense solar energy C. Ascending, cooling air D. Descending, warming air E. Rising hot air