Thursday, August 7, 2014


We just learned about the metalloid semiconductor called Silicon.

One type of rock found on the earth is Obsidian.

Obsidian is a dark black glassy igneous rock that is made from lava.

By itself it is not a chemical element on the Periodic Table, it is usually made up of other elements combined, like Silicon, Magnesiu, Iron and Oxygen.
(from: wikipedia - obsidian)

Kid Facts - Blast from the past: Electrodes