Downdrafts and updrafts found side by side occur during the ________ in the life cycle of an air mass thunderstorm
A) dissipating stage B) cumulus stage C) mature stage
C
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When water changes from a liquid to a vapor, it
A. gives heat to the environment. B. does not exchange energy with the environment. C. absorbs heat from the environment. D. condenses.
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
How have scientists used isotopic analysis to determine the rise of atmospheric CO2 is mostly from the burning of fossil fuels?
A) Since 14C is an unstable isotope, scientists have dated the atmospheric carbon to the period since the Industrial Revolution. B) Both coal and oil contain a high proportion of 14C. By analyzing, 14C/12C ratios, scientists have been able to determine the source based on this fact. C) The low proportions of 13C and 14C within atmospheric CO2 indicates the source is fossil carbon. D) 14C concentrations are much higher in urban areas than in rural areas, indicating fossil fuels must have a higher 14C/12C ratio than carbon from other sources.
Considering the vertical dimension, which of the following describes the direction of the pressure gradient force (PGF), and the gravitational force?
A. Both forces are directed away from the Earth. B. Both forces are directed toward the Earth. C. The PGF is directed away from the Earth and the gravitational force toward the Earth. D. The PGF is directed toward the Earth and the gravitational force away from the Earth.