Which of the following is the best definition of a mineral? a naturally occurring liquid that can be used to make oil a crystalline solid that occurs naturally on earth a substance made from raw materials a material that people make for some purpose
it is science

I do believe it is B. A crystalline solid that occurs naturally on Earth. Because honestly, that's the only one that makes sense to me

Without more information I can’t help you write the actual essay but I can help you with the formatting.

For the introduction, you need background information for you experiment. Why you did it, why you used what you used, basically anything that the reader needs to know before you go into detail about the actual experiment.

The procedures are easy. You essentially just need to walk the reader through the experiment step by step with enough detail that they could recreate it on their own if they wanted. I don’t know about your teacher, but most prefer you don’t use personal pronouns (I.e. “I” “me” “my” “you” etc) so I usually write them as a set of commands (“first, make sure any surfaces being used are throughly sterilized”)

For sources of error, look through the experiment. Are there any areas where contamination could occur? Were there any measurements you had to take that were inexact or could’ve been misread or misinterpreted? Things like that.

Hope this helps! Good luck!