Geochemical Cycles

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Geochemical Cycles

• MP 1.5

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Water Cycle Hydrological Cycle

• A series of events where water is stored and/or
  transferred.

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Water Storage

• Water is stored in lakes, rivers, clouds, snow,
  and glaciers.

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Methods of Transfer

• Precipitation (rain), rain runoff, condensation,
  sublimation, evaporation, transpiration, and
  snowmelt.

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The Carbon Cycle

• Shows where all carbon comes from and goes to.
• All animals and most cells release CO2. Plants
  use it to make food.
• Only photosynthesis and decomposition return
  carbon to the earth most other processes release
  it to the atmosphere

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Carbon Cycle

• CO2 is a greenhouse gas that traps heat in the
  atmosphere.

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The Greenhouse Effect
Some heat escapes into space
Section 4-1
Sunlight
Atmosphere
Greenhouse gases trap some heat
Earths surface
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The Nitrogen Cycle
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4 Processes of Nitrogen Cycle

• Fixation breaks stable nitrogen molecule apart
  so it can be attached, done by lightning and
  bacteria.
• Decay when plants and animals break down they
  return their nitrogen to the earth as ammonia.
• Nitrification conversion of ammonia from waste
  and decomposition to nitrates that plants must
  consume to grow (like fertilizer).
• Denitrification Nitrates are turned back into
  gas and released to atmosphere.

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The Nitrogen Cycle
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The Phosphorus Cycle
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Phosphorus Cycle

• Important for plants and animals because it is a
  major constituent of DNA
• Unlike other cycles it does not have a gaseous
  state at normal temperatures so it cycles through
  soil, water and sediments.
• Plants pick it up through soil and animals get it
  from eating plants or eating animals that eat
  plants.
• Stored in rocks and sediments for millions of
  years until released by weathering.