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Carbon is present in the atmosphere as ________.
a. carbon dioxide
b. carbonate ion
c. carbon dust
d. carbon monoxide
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- At a time before life existed on Earth, our planet's atmosphere contained extremely little or no Question 2 options: a) nitrogen gases b) water vapor c) carbon dioxide d) gaseous oxygen e) noxious gasesOver the past decades, the CO2 concentration in the atmosphere has increased. a. Predict the effect of increasing carbon dioxide concentrations on photorespiration. b. Scientists suggest that increasing CO2 concentrations are leading to higher average global temperatures. If temperatures are increasing, does this change your answer to part (a)?What will happen, if there was no CO2 in the earth's atmosphere?
- A methanogena. uses methane gas as an energy source.b. uses H2 to reduce CO2.c. requires oxygen gas.d. Two of the above are true.Human use of fossil fuels has what consequences? Group of answer choices a. increase in CO2 concentration in the atmosphere b. return of fossilized carbon to the active carbon cycle c. increase in global temperatures d. all of the other optionsWhy is it important the concentration of CO2 in the atmosphere?
- About how much mercury was emitted by fossil fuel combustion in Asia? A.)340 tons B.)0 tons C.)40 tons D.)525 tonsThe recent increase in atmospheric CO2 concentration is mainly a result of an increase in a. plant growth. b. the absorption of heat radiating from Earth. c. the burning of fossil fuels and wood. d. cellular respiration by the increasing human population.Which region emitted the greatest amount of total mercury? A.)Asia B.)South and Central America C.)North America D.)Middle East
- Which of the following statement is true about fossil fuels? A. Lignite is the highest-grade coal in fossil fuel B. Fossil fuels are presently the world’s primary energy source. C. Fossil fuels are formed in an oxygen-rich environment D. Low pressures and temperature facilitate the formation of fossil fuelThe main cause of the increase in the amount of CO2 in Earth’satmosphere over the past 150 years is(A) increased worldwide primary production.(B) increased worldwide standing crop.(C) an increase in the amount of infrared radiation absorbedby the atmosphere.(D) the burning of larger amounts of wood and fossil fuelsWhich type of UV radiation does the ozone block the most of? a. UV-B radiation b. UV-A radiation c. All UV radiation d. UV-C radiation