Carbon Cycle
Burning of fossil fuels and forests releases this.
What is CO2?
Phosphorus is mostly contained in these.
What are rocks and minerals?
Groundwater is taken up by this.
What are plant roots?
Some N2 gas is fixed by this.
What is lightning?
The fossil fuels include these.
What are coal, oil, and natural gas?
This returns the sulfur for the next generation of phosphorus in the soil.
What are waste products?
Water evaporates and condenses to form these.
What are clouds?
N2 is fixed by this.
What is bacteria?
This releases CO2.
What is geological activity?
Phosphorus is taken up by this.
What are primary producers?
Water seeps into the ground to form this.
What is groundwater?
Our atmosphere is this percentage of nitrogen gas.
What is 78%?
Too much CO2 in the atmosphere may be responsible for this.
What is the greenhouse effect?
Phosphorus is mined, and turned into this.
What is fertilizer?
Water falls to the surface as this.
What is precipitation?
These cannot directly use all the nitrogen found in our atmosphere.
What are plants and animals?
More CO2 is released in the atmosphere today than in the past because of this.
What are volcanoes?
Phosphorus is released by this.
What is excretion?
Atmospheric water is know as this.
What is H2O gas?
Animal waste decay by the action of bacteria which creates this.
What is ammonia?