Earth Science/Biology Standard 7a. Students know the carbon cycle of photosynthesis and respiration and the nitrogen cycle. What is nitrogen?. Chemical element N, atomic number=7 Colorless, odorless, tasteless, inert gas Makes up 78% of the atmosphere N 2 ,Dinitrogen gas, (Diatomic ) .
7a. Students know the carbon cycle of photosynthesis and respiration and the nitrogen cycle.
N, atomic number=7
Proteins and nucleic acids (DNA, RNA) in living organisms
Nitrogen gas (N2)-> cannot be used directly.
* Animals get nitrogen from plants or animals that ate plants
Atmospheric Nitrogen: N2
The process by which nitrogen is converted between its chemical forms
It can be carried out by both biological and non-biological processes
Bacteria are key element of the cycle
Industrial: great pressure and temperature
Triple bond is very stable
Nitrogen gas- ammonia
Mainly through bacteria
Very small, microscopic
Bacteria living in root nodules of LEGUMES (soybeans, peanuts, alfalfa)
Bacteria living in soil and water
amino acids, nucleotides
(greenhouse gas, destroys ozone layer)
Too much nitrogen in the water (mostly due to runoff from land) -> more algae (algal blooms) -> take up oxygen-> affects other organisms (animal lives die)
7c. Students know the movement of matter among reservoirs is driven by Earth's internal and external sources of energy