chapter 25.1-.2, 26.2-.3, 48 Flashcards
Carbon cycle
the intricately linker network of biological and physical processes that shuttles carbon among rocks, soil, oceans, air and organisms
Correlation
the co-occurrence of two event or processes; correlation does not imply causation
Causation
a relationship in which one event leads to another
Reservoirs
a supply or source of a substance. reservoirs of carbon, for example, include organisms, the atmosphere , soil, the oceans, and sedimentary rocks
Biomass
the total mass of organisms in a given area or volume
Fluxes
the rate at which a substance, for example carbon, flows from one reservoir to another
Biomineralization
the precipitation of minerals by organisms, as in the formation of skeletons
Greenhouse gas
a gas in the atmosphere that allows incoming solar radiation to reach the Earth’s surface, but absorbs radiation re-emitted as heat, trapping it in the atmosphere and causing the temperature to rise
Oxygenic
producing oxygen
Aerobic
utilizing oxygen
Anoxygenic
not producing oxygen; anoxygenic photosynthetic bacteria do not gain electrons from water and so do not generate oxygen gas
Assimilation
the process by which organisms take up nutrients from the environment
Nitrogen fixation
the process in which nitrogen gas is converted into ammonia, a form biologically useful to primary producers
Nitrification
the process by which chemoautotrophic bacteria oxidize ammonia to nitrite and then to nitrate
Denitrification
the process in which some bacteria use nitrate as an electron acceptor in respiration