biogeochemical cycles
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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 - PowerPoint PPT PresentationTRANSCRIPT
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Biogeochemical Cycles
Unit 6-2 NotesMr. Hefti - Pulaski Biology
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You’ve seen this before – what does it mean?
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Earth has a finite supply of resources
*Bio = life
*Geo = earth
*Chemical = having to do w/ atoms
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Layers of Earth
• Lithosphere: Rocks / soils • Hydrosphere: Water• Atmosphere: Air• Biosphere: Any place there is life
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Phosphorus Cycle
• P released from weathered rocks and decaying organisms
• Why is it important?– P holds DNA molecule together– Used to make ATP
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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
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Condensation
Precipitation
Runoff
Evaporation
Ground water
LakeSoil
Ocean
The Water Cycle
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Carbon Cycle
• C gets transformed through:– Photosynthesis– Respiration– Burning of fossil fuels
• Why is it important?– Needed to make glucose
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CO2 in the atmosphere
Used to make glucose during photosynthesis
Plants eaten by animals
Decaying plants make
C in rotting tissue
C in fossil fuels
CO2 released to atmosphere during
respiration
CO2 released to atmosphere when
fossil fuels are burned
The Carbon Cycle
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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
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Nitrogen in atmosphere
Nitrogen in animal proteins
Nitrogen in plant proteins
The
Nitr
ogen
Cyc
le
Nitrogen in decaying tissues
Soil bacteria “fix” nitrogen for use by plants
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Oxygen Cycle
• Living things need O2
• Needed for release of energy
• Why is it important?– Cellular respiration
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At night, plants take in O2 and give off CO2
During day, plants take in CO2 and give off O2
Animals take in O2 and give off CO2
The Oxygen Cycle
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The Water Cycle The Water Cycle
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The Carbon Cycle The Carbon Cycle
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The Nitrogen Cycle The Nitrogen Cycle
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The Oxygen Cycle The Oxygen Cycle
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The Phosphorus Cycle The Phosphorus Cycle