esrm100s03 - Lesson 3 Biogeochemical Cycles Big Question...

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Lesson 3: Biogeochemical Cycles Big Question:  Why Are Biogeochemical Cycles Essential to Long-Term Life on Earth?
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Lesson 3/ ESRM 100 / University of Washington What is a Biogeochemical Cycle? A biogeochemical cycle is the complete path a chemical takes  through the Earth’s four major reservoirs: • atmosphere • hydrosphere (oceans, rivers, lakes, groundwaters, and  glaciers) • lithosphere (rocks and soils) • biosphere (plants and animals).
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Lesson 3/ ESRM 100 / University of Washington Chemical Sinks Chemicals enter storage compartments - sinks Amount that moves between compartments is the flux net sink - when input exceeds output  net source - if output exceeds input. 
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Lesson 3/ ESRM 100 / University of Washington New Carbon versus Fossil Carbon
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Lesson 3/ ESRM 100 / University of Washington Essential Elements 24 elements are required for life Macronutrients are required in large quantities • carbon, hydrogen, nitrogen, oxygen, phosphorus, and  sulfur. Micronutrients are required in small/medium quantities, or not at  all in some organisms • copper, sodium, iodine • See  dhmo.org  for a discussion of the deadly chemical  dihydrogen monoxide.
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Lesson 3/ ESRM 100 / University of Washington Essential Elements
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