Science, Technology and the Environment (SC NATS 1840A) - Tuesday
October 30 , 2012h
Readings: Ch. 4.7, Activity 4
Biogeochemical Cycles Part IV – Matter Cycles
Generic Matter Cycle: Picture Shown
Carbon is backbone of all life on Earth. Organic molecules provide structure, food, etc. for living
Found in the
Biosphere (in living organisms)
Lithosphere (in sedimentary rocks)
Hydrosphere (dissolved CO2 gas in oceans and lakes)
Atmosphere (CO2 Gas)
Continuously exchanged between all compartments.
CO2 gas is only 0.03% of the atmosphere, but the exchange between air and the biosphere is at the root
of the carbon cycle.
Water cycle driven by solar energy, causing evaporation of surface water. Water vapour carries
this energy in thermal form.
Vaporization of 1kg of water requires 2260 KJ
Energy released to air upon condensation
Flowing water shapes of the Earth over long time scales. Flowing water also transports vital biological