For many years, fossils have been known as one of nature's natures. Men use everything that is endanger for their own use.It is our duty to protect and show our nature's treasure to people so they know how deeply rich our universe is. 

One of them is petrified wood that we don't recognize as wood. They appear as colorful rocks, so sometimes it is hard to see what they are made from. An amazing process happened a few hundred years ago inside of the earth with constant mineralization. it turned them into solid rocks and become a crystal.