During this process plants use sunlight, water, and carbon dioxide to make their own food.
What is Photosynthesis
100
After water vapor does this it falls to the Earth as rain
What is condensates
100
This gas makes up most of the Earth's atmosphere
What is Nitrogen
200
Water vapor turning into water
What is Condensation
200
Plants and animals release this as a product of respiration
What is Carbon Dioxide
200
This is how chemicals and pesticides get into groundwater
What is rain
200
This is where plants get the nitrogen they need
What is the soil
300
Water falling from clouds
What is Precipitation
300
Plants release this into the atmosphere as a byproduct of photosynthesis
What is Oxygen
300
This is what happens when the sun heats bodies of water
What is Evaporation
300
These are the two "fixed" forms of nitrogen
What are ammonia and nitrates
400
Process of releasing energy from food
What is Respiration
400
Burning fuels is a cause of this
What is an imbalance of the carbon-oxygen cycle
400
This is where most of Earth's freshwater can be found
What are ice caps and glaciers
400
This is what plants make using "fixed" nitrogen
What are proteins
500
Plants losing water through their stomata
What is Transpiration
500
Planting a tree or garden, walking or riding a bike instead of driving, wearing layers instead of turning up the heat, and using a manuel lawn mower all help do this
What is help keep the carbon-oxygen cycle in balance
500
This is the percent of freshwater that can be used by people and other land organisims