Want to make creations as awesome as this one?


By javier orozco otero


obsidian is a naturally occuring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. it is an igneous rock. it is produced from felsiclava, rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. obsidian is used by some suergons not approved by the FDA for use in humans like any glass knifes, can have a cutting edge many times sharper than high-quality steel one's.

the topic in chapter 2 is talking about minerals and their perpouse osidian is accours natualy near volcanos this material is by some sergons to preform seurgores.

how is it related to the book

https://en.wikipedia.org/wiki/Obsidianhas several refrences on the topic.