DO NOWDraw the hydrologic cycleLabel all parts of your diagram

Biogeochemical Nutrient Cycles

Hydrologic Cycle

Reserviors

Residence Times

Biogeochemical Nutrient CyclesNitrogenPhosphorusSulfurCarbon-OxygenHydrologicRock

The nitrogen cycle

The phosphorus cycle

The sulfur cycle

The carbon-oxygen cycle

The hydrologic cycle

The rock cycle

Rock cycle = The heating, melting, cooling, breaking and reassembling of rocks and minerals

Rocks help determine soil chemistry, which influences ecosystems

Helps us appreciate the formation and conservation of soils, mineral resources, fossil fuels, and other natural resources

Newton’s LawsConservation of Mass – mass cannot be created or destroyed, but can be changed to energy

Newton’s Laws - FirstThermodynamics – inertia – an object in motion stays in motion unless acted upon by an outside force

Newton’s Laws - SecondThermodynamics – entropy– disorder increasesThink of entropy as heat lossWe must add more energy to compensate for the heat loss

Hypoxia and the Gulf of Mexico’s Dead Zone (Read pp202-203)Observations: low oxygen levels - hypoxiaHypothesis: caused by nutrients (fertilizers)

that ran into the Gulf from riversExperiments: monitoring oxygen (long

term), water sampling (N, NaCl. Bacteria, phytoplankton); observed life; analyzed historical data

Results: phytoplankton receiving too much phosphorus from farming & sewage treatment plants