DO NOW Draw the hydrologic cycle Label all parts of your diagram

Biogeochemical Nutrient Cycles

Hydrologic Cycle

Reserviors

Residence Times

Biogeochemical Nutrient Cycles Nitrogen Phosphorus Sulfur Carbon-Oxygen Hydrologic Rock

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 Laws Conservation of Mass – mass cannot be created or destroyed, but can be changed to energy

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

Newton’s Laws - Second Thermodynamics – entropy– disorder increases Think of entropy as heat loss We must add more energy to compensate for the heat loss

Hypoxia and the Gulf of Mexico’s Dead Zone (Read pp ) Observations: low oxygen levels - hypoxia Hypothesis: caused by nutrients (fertilizers) that ran into the Gulf from rivers Experiments: 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