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Carbon cycle: Quiz


Question 1: In the oceans, carbonate can combine with ________ to form limestone (calcium carbonate, CaCO3, with silica), which precipitates to the ocean floor.

Question 2: Otherwise, anaerobic respiration occurs and releases methane into the surrounding environment, which eventually makes its way into the atmosphere or hydrosphere (e.g., as marsh gas or ________).

Question 3: This buffer factor is often called the "Revelle Factor", after ________.
RV Roger Revelle (AGOR-24)OceanographyCharles David KeelingRoger Revelle

Question 4: Volcanic gases are primarily water vapor, carbon dioxide and ________.
Sulfuric acidSulfur dioxideAcetic acidHydrogen sulfide

Question 5: ________ and bacteria break down the carbon compounds in dead animals and plants and convert the carbon to carbon dioxide if oxygen is present, or methane if not.

Question 6: Around 42,000 gigatonnes of carbon are present in the ________.
Environmental historyBiosphereEnvironmental technologyEnvironmental economics

Question 7: The ________ of silicate rock (see Carbonate-Silicate Cycle).
MineralOxygenCalcium carbonateWeathering

Question 8: This includes the uptake of dead organic material (________) by fungi and bacteria for fermentation or decay.

Question 9: Other gases containing carbon in the atmosphere are methane and ________ (the latter is entirely anthropogenic).
Carbon tetrachlorideChloroformHalomethaneChlorofluorocarbon

Question 10: Autotrophs are organisms that produce their own ________ using carbon dioxide from the air or water in which they live.
Organic compoundBiochemistryAmino acidOrganic chemistry

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