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Download Biogeochemical Cycles
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Biogeochemical Cycles Honors Biology Energy FLOWS through ecosystems ◦ Sun Chemical Energy Usable Energy Heat (glucose, food) (ATP) Energy is never created nor destroyed, but can change forms ◦ Law of thermodynamics Recall Matter is conserved in chemical reactions ◦ Not created nor destroyed but can be changed ◦ Conservation of matter Matter in Ecosystems Atmosphere ◦ Gases that surround Earth Hydrosphere ◦ All water on Earth Geosphere/Lithosphere ◦ Solid Earth Biosphere ◦ All life on Earth Earth’s Spheres What happens in one sphere effects the others Bio = life ◦ Geo = Earth Chemical = processes ◦ Cycles = series of repeated events Responsible for the cycling of matter in ecosystems, essential to life 4 cycles: ◦ ◦ ◦ ◦ Phosphorus Water Nitrogen Carbon** Biogeochemical Cycles Phosphorus is needed for nucleic acids, ATP, cell membranes Phosphorus Cycle Water is essential to the metabolism of all organisms Water Cycle Nitrogen is part of amino acids, proteins and nucleic acids Nitrogen Cycle Carbon forms the the framework of all molecules essential to life Key processes: ◦ Photosynthesis Plants use CO2 for photosynthesis, make glucose and O2 ◦ Cellular respiration All organisms use glucose and O2 to make ATP, release CO2 ◦ Human impact! Activities increase in CO2 atmosphere Removing plants means CO2 isn’t being cycled as quickly as it is being added Greenhouse effect and global climate change Carbon Cycle
