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Unit 6-2 Notes Mr. Hefti - 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 Atmosphere: Air Biosphere: Any place there is life Phosphorus Cycle • P released from weathered rocks and decaying organisms • Why is it important? – P holds DNA molecule together – Used to make ATP The Phosphorus Cycle Rot Soil decomposers 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 Condensation Precipitation Evaporation Runoff Soil Lake Ocean Ground water The Water Cycle Carbon Cycle • C gets transformed through: – Photosynthesis – Respiration – Burning of fossil fuels • Why is it important? – Needed to make glucose CO2 released to atmosphere when fossil fuels are burned CO2 released to atmosphere during respiration Used to make glucose during photosynthesis Plants eaten by animals C in rotting tissue C in fossil fuels Decaying plants make The Carbon Cycle CO2 in the atmosphere 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 The Nitrogen Cycle Nitrogen in atmosphere Nitrogen in animal proteins Nitrogen in plant proteins Nitrogen in decaying tissues Soil bacteria “fix” nitrogen for use by plants Oxygen Cycle • Living things need O2 • Needed for release of energy • Why is it important? – Cellular respiration At night, plants take in O2 and give off CO2 During day, plants take in CO2 and give off O2 The Oxygen Cycle Animals take in O2 and give off CO2 The Water Cycle The Water Cycle The Carbon Cycle The Carbon Cycle The Nitrogen Cycle The Nitrogen Cycle The Oxygen Cycle The Oxygen Cycle The Phosphorus Cycle The Phosphorus Cycle