1. Material Cycles
Ecosystem recycling

2. As energy & matter move through exostyem matter must be recycle and reused
Types of Cycle
Carbon & Oxygen Cycles
Water Cycle
Nitrogen Cycle

3. Carbon & Oxygen cycle
Involves the process of photosynthesis & respiration
Photosynthesis uses CO2 and produces O2
Respiration use O2 and produces CO2
The carbon cycle is one of the most important to humans because it is important to our existence: 
one of the primary elements forming human tissues 
necessary to plants, the basis of human food 
important to the climate system which sets the background for our environment: 
carbon dioxide (CO 2 ) and methane (CH 4 ) are greenhouse gases which help set global temperatures 

7. Human influences on carbon cycle
In last 150 years atmospheric CO2 has risen 30%
This is caused by burning fossil fuels and burning forests (to clear land for agriculture)
Now less vegetation is available to absorb CO2 from atmosphere through photosynthesis
Increased levels CO2 is causing global climate change

8. Water Cycle
Availability of water is one of the key factors that determine the productivity of a terrestrial ecosystem
Water is found in bodies of water, atmosphere, the ground and living organisms
Involves
Photosynthesis & Respiration
Transpiration (movement of water through a plant)
Evaporation & Condensation
Excretion

9. Heat causes water to EVAPORATE from bodies of water, soil and organisms
Transpiration is when water evaporates from plants
Water leaves the atmosphere through PRECIPITATION

10. Nitrogen Cycle
Involves decomposers and other soil bacteria which break down and convert nitrogenous wastes and the remains of dead organisms into material that is usable by autotrophs (nitrates)
Nitrogen fixing bacteria—transform nitrogen gas into a usable form
Live in soil and inside swellings on roots of certain plants (mutualism)