Encyclopedia of Earth
Encyclopedia of Earth: Biogeochemistry: Phosphorus Cycle
Article explaining what the phosphorus cycle is, where it occurs, its place in the biotic world, and the environmental impact of human activities on the phosphorus cycle. (Published: October 8, 2009)
Geography 4 kids
Geography4 kids.com: Cycling Phosphorus
An essential element in the ecosystem is phosphorus. Discover the phosphorus cycle, what depends upon it, and how it works.
Science Struck
Science Struck: Red Phosphorus Uses
Describes some of the characteristics of phosphorus, what red phosphorus is specifically, as well as the uses of red phosphorus.
Other
What Is a Soil Test?
The North Carolina Department of Agriculture explains soil testing, taking a soil sample, and analyzing the results.
Chem4kids
Chem4 Kids: Element List
Site provides the first 18 elements found in the Periodic Table. Click on an element to discover where it is found and what it's characteristics are.
Other
Ed Hume Seeds: Testing Your Soil
Conduct a soil test to find out what nutrients your soil is lacking. This site gives directions on how to gather a soil sample and what nutrients you should test for to get the best soil.
Science Struck
Science Struck: Ground State vs. Excited State of an Atom
Explains what Bohr's model of the atom is, the characteristics of the ground and excited states of an atom, and the electron configuration for each in the example of Phosphorus.