Classification
Biological, Geological, chemical/physical, human activity.
What are the four levels of classification?
Basins
Some of the phosphorus in soils can be washed away into water ___.
Volcanoes
Another natural source for CO2 is ___.
78%
Our atmosphere is ___ nitrogen gas.
Activities performed by living organisms.
What is Biologica?
Overgrowth
Too much phosphorus in water leads to plant __, strangling all other life forms in the water.
Movement of carbon atoms through the land, water, and atmospher.
What is the carbon cycle?
Atmosphere
Animals and plants can’t directly use all the nitrogen found in our ______.
Volcanic eruptions, rock formations and plate tectonic.
What is Geological?
Too much growth.
Why is the use of too much phosphorus rich fertilizers bad for environmen?
Ocean
The ___ is the main regulator of CO2 in the atmosphere because C02 dissolves easily in it.
nitrogen fixing
what is special bacteria that can use nitrogen in our atmosphere and fix it so other organisms can survive?
Formation of clouds, lighting, flow of water.
What is chemical/physical?
Rocks and Minerals
Phosphorus is not found in the free state in nature, but is contained mostly in __ and __
Oil, coal, and natural gas
Today these deposits are burned as fossil fuels which include __, _____, and _____ ___.
Protein
Higher organisms use nitrogen to make their _____.
Mining and burning of fossil fuels, clearing of land, use of fertilizers.
What is Human activity?
DNA
What is an essential nutrient for life, as it makes up important chemicals such as ___
Burning fossil fuels
More CO2 is released into the atmosphere today than in the past because of ________.
Nitrogen cycle
What is Nitrogen being converted into different chemical forms as it circulates through the earth?