1) a process in which bacteria in the soil convert decomposing organic material into ammonium a) denitrification b) biosphere c) ammonification d) nitrogen fixation 2) the process in which bacteria and other agents break apart nitrites to form nitrogen gas a) mineralization b) denitrification c) ammonification d) nitrogen fixation 3) a process in which microorganisms in soil take in ammonium and nitrates from the soil for energy a) biosphere b) immobilization c) nitrogen assimilation d) nitrification 4) the process of converting organic materials into ammonia and then ammonium a) nitrification b) abiotic c) atmosphere d) mineralization 5) a process in which different kinds of bacteria convert some ammonia created by mineralization into nitrites and nitrates a) denitrification b) nitrification c) lithosphere d) ammonification 6) the process in which organisms convert nitrogen compounds into useful chemicals a) biotic b) nitrogen assimilation c) mineralization d) immobilization 7) the process by which nitrogen gas from the atmosphere is converted into forms of nitrogen that can be used, such as ammonia, nitrites, and nitrates a) nitrogen fixation b) biotic c) nitrification d) lithosphere 8) all parts of Earth with living organisms a) lithosphere b) biotic c) nitrification d) biosphere 9) the layers of gases that surround Earth a) immobilization b) abiotic c) nitrogen fixation d) atmosphere 10) Earth's hard, rocky shell, that extends down to the upper mantle and is composed of the continental lithosphere and the oceanic lithosphere a) nitrification b) biosphere c) atmosphere d) lithosphere 11) nonliving things a) nitrification b) lithosphere c) abiotic d) immobilization 12) living things a) biotic b) atmosphere c) nitrogen assimilation d) biosphere

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