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CYCLING IN THE ECOSYSTE M 18.4 pp. 371-374 DEFINITIONS Ecosystem: an environment where the living (biotic) and non-living (abiotic) things affect one another Biogeochemical process: circulation of substances through living organisms and the environment WATER CYCLE WATER CYCLE • Evaporation: water vapor enters the atmosphere WATER CYCLE • • Evaporation: water vapor enters the atmosphere Transpiration: evaporation of water through the leaves of plants WATER CYCLE • Precipitation: water vapor that leaves the atmosphere CARBON CYCLE CARBON CYCLE Photosynthesis: converting light energy into organic compounds (C6H12O6) CO2 + H2O C6H12O6 CARBON CYCLE Cellular respiration: breaks down sugar to release energy and CO2 is released into atmosphere (C6H12O6 CO2 + H2O + ATP) CARBON CYCLE Combustion: releases CO2 burning of fossil fuels for energy NITROGEN CYCLE • 70% of atmosphere is nitrogen, but it is not in a ready to use form • N2 needs to converted into NH3 (ammonia) NITROGEN CYCLE nitrogen fixation: bacteria convert nitrogen gas (N2) to usable form, NH3 (ammonia) NITROGEN CYCLE nitrogen fixation: bacteria convert nitrogen gas (N2) to usable form, NH3 (ammonia) ammonification: decomposers break down wastes (urine, feces, death) to NH3 NITROGEN CYCLE nitrification: bacteria convert NH3 to nitrates (NO3-) i.e. like fertilizers assimilation: plants absorb nitrate to make amino acids (enters food chain) NITROGEN CYCLE Denitrification: bacteria atmosphere (NO3- N2) return nitrogen to Complete Cycles trifold Use textbook and handout to draw cycles in the appropriate area. Cycles should be neat, simple, labeled, and colored