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Chapter 18.4

Chapter 18.4 vocab

biogeochemical cycle how substances such as water, carbon, nitrogen, calcium, and phosphorus pass between the living and nonliving worlds
groundwater water in the soil or in underground formations of porous rock
water cycle the movement of water between various reservoirs
transpiration the process of most water that evaporates from terrestrial ecosystems passing through plants
carbon cycle Photosynthesis and cellular respiration form the basis of this short term
nitrogen cycle the complex pathway that nitrogen follows in an ecosystem
nitrogen fixation the process of converting N2 gas to nitrate
nitrogen-fixing bacteria most organisms rely on this ; it transforms nitrogen gas into a usable form
ammonification the process of decomposers breaking down materials like dead bodies, poop, and pee and releasing the nitrogen that contain as ammonia, NH3, which in soil becomes NH4
nitrification the process of soil bacteria taking up ammonium and oxidizing it into nitrites, NO2-, and nitrates, NO3-
denitrification the way that nitrogen it returned to the atmosphere
phosphorus cycle the movement of phosphorus from the environment to organisms and then back to the environment
Created by: CoffeyM20



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