EHST 2110 Final Exam Questions and Answers 100% Correct
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Course
EHST 2110
Institution
EHST 2110
EHST 2110 Final Exam Questions and Answers 100% CorrectEHST 2110 Final Exam Questions and Answers 100% CorrectEHST 2110 Final Exam Questions and Answers 100% CorrectEHST 2110 Final Exam Questions and Answers 100% Correct
Composistion of the Atmosphere - ANSWER - 78% nitrogen
21% oxygen
0.9% argo...
EHST 2110 Final Exam Questions and
Answers 100% Correct
Composistion of the Atmosphere - ANSWER - 78% nitrogen
21% oxygen
0.9% argon
0.03% carbon dioxide
Troposphere - ANSWER - sea level to 8 miles above earth; temperature falls with increasing
altitude
stratosphere - ANSWER - 8-30 miles above Earth; temperature slowly rise with increasing
altitude
site of ozone layer - ANSWER - stratosphere
mesosphere - ANSWER - uppermost layer where air becomes progressively more diffuse;
temperature falls with increasing altitude
thermosphere - ANSWER - region above the mesosphere and below the exosphere;
temperature typically 200C
CFCs - ANSWER - chlorofluorocarbons; chemicals used as refrigerants and aerosol propellants
halons - ANSWER - bromofluorocarbons; fire suppressant; widespread use in 1960s-1970s
1978 - ANSWER - nationwide ban on ozone-depleting gases
natural air pollution - ANSWER - volcanic eruptions, forest fires, dust storms, methane gas
released from organic matter decay
, industrialized nations largest sources are: - ANSWER - transportation, electric power plants that
burn coal or oil, industry: steel mills, metal smelters, oil refineries, paper and pulp mills
1985 - ANSWER - hole in ozone represented 40% decline in ozone concentration; continues to
increase
Rising levels of atmospheric CO2 - ANSWER - as CO2 increases, more infrared radiation will be
absorbed, and average global temperatures will increase
Greenhouse effect - ANSWER - atmospheric CO2 plays a vital role in moderation the Earth's
temperature; atmosphere allows light to enter but prevents the escape of heat
other greenhouse gases - ANSWER - methane, nitrous oxide, halocarbons, water vapor
methane (CH4) - ANSWER - far more potent greenhouse gas; rice cultivation, microbial activity
in cattle termite intestines, landfills, gas and coal production emissions, oil rig flares, tropical
deforestation
halocarbons - ANSWER - CFCs, PFCs, SF6, HFCs; each molecule has a direct warming effect
12,000-20,000 times greater than a CO2 molecule
nitrous oxide (N2O) - ANSWER - laughing gas; atmospheric concentrations are up 17% since
1750; natural by-product of the metabolism of certain soil microbes
climate - ANSWER - Prevailing weather conditions of an area in general or over a long period of
time
climate change - ANSWER - change in the usual weather found in a place; change in rainfall,
temperature, or overall Earth's weather patterns
evidence for climate change - ANSWER - ice core analyses; melting sea ice and mountain
glaciers; ocean waters eating up and acidifying; increasing height of the tropopause; shifting
range of biological species and temporal advancement of spring events
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