Model+of+Silicon

There are two main types of compounds:

Silicon Dioxide- Also known as silica, this compound is the most common compound found with silicon. It is what is in sand, rocks and is ussually made into glass, concrete and gells. There are no positive facts that silica harms your body exept it is thougt that the fine powder when inhailed lodges in the lungs, irritating and slowly iching them. it is thought to lead to bronchitis.

Silicate- Is mostly found in a rocks, Igneous, sedimentary and metimorphic. There is not really many uses for this compound but plankton make there shells out of silicate. The planets crust is mostly made from silicate, as is the moon and other rocky planets.

http://en.wikipedia.org/wiki/Silicate www.periodictable.com "Solar Energy" by Matt humder