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Biogeochemical Cycles

Biogeochemical Cycles. Unit 6-2 Notes Mr. H efti - Pulaski Biology. You’ve seen this before – what does it mean?. Earth has a finite supply of resources * Bio = life * Geo = earth * Chemical = having to do w/ atoms. Layers of Earth. Lithosphere: Rocks / soils Hydrosphere: Water

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Biogeochemical Cycles

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  1. Biogeochemical Cycles Unit 6-2 Notes Mr. Hefti - Pulaski Biology

  2. You’ve seen this before – what does it mean?

  3. Earth has a finitesupply of resources *Bio = life *Geo = earth *Chemical = having to do w/ atoms

  4. Layers of Earth • Lithosphere: Rocks / soils • Hydrosphere: Water • Atmosphere: Air • Biosphere: Any place there is life

  5. Phosphorus Cycle • P released from weathered rocks and decaying organisms • Why is it important? • P holds DNA molecule together • Used to make ATP

  6. The Phosphorus Cycle Rot Soil decomposers

  7. Water Cycle • H2O supply replenishes itself through: • Evaporation (and transpiration) • Condensation • Precipitation • Runoff • Why is it important? • Earth would dry out without the water cycle

  8. Condensation Precipitation Evaporation Runoff Soil Lake Ocean The Water Cycle Ground water

  9. Carbon Cycle • C gets transformed through: • Photosynthesis • Respiration • Burning of fossil fuels • Why is it important? • Needed to make glucose

  10. CO2 in the atmosphere CO2 released to atmosphere when fossil fuels are burned Used to make glucose during photosynthesis CO2 released to atmosphere during respiration The Carbon Cycle Plants eaten by animals C in rotting tissue Decaying plants make C in fossil fuels

  11. Nitrogen Cycle • Life requires N-compounds but atmospheric nitrogen (N2) unusable to most living things • Nitrogen-fixing bacteria important! • Why is it important? • Needed to make proteins

  12. Nitrogen in atmosphere The Nitrogen Cycle Nitrogen in animal proteins Nitrogen in plant proteins Nitrogen in decaying tissues Soil bacteria “fix” nitrogen for use by plants

  13. Oxygen Cycle • Living things need O2 • Needed for release of energy • Why is it important? • Cellular respiration

  14. During day, plants take in CO2 and give off O2 At night, plants take in O2 and give off CO2 The Oxygen Cycle Animals take in O2 and give off CO2

  15. The Water Cycle The Water Cycle

  16. The Carbon Cycle The Carbon Cycle

  17. The Nitrogen Cycle The Nitrogen Cycle

  18. The Oxygen Cycle The Oxygen Cycle

  19. The Phosphorus Cycle The Phosphorus Cycle

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