How do you identify obsidian?

obsidian is molten glass from inside a volcano that, when it is expelled from the volcano and cooled down, forms the igneous rock obsidian!

to count how many boogers you have

Premises are usually the facts, assumptions or the statements made explicitly or implicitly by the author in the essay. These can be easily identified as they are the directly given in the paragraph....

u can play football

I doubt it. Obsidian is a very hard, glass-like black rock that can be split to give a very sharp cutting edge.