because aluminium is light and they are not charging for the can just the substance thats in it
This is because of the refractive propoties of the immersion oil. The oil works as a sort of secondary lens, magnifying the specimin in addition to the lens alresdy present.
click on the thing u want 2 change go to propoties click customize go 2 change icon change icon click apply click ok
Well I am in 8th grade and I had a project to do about this. List of Minerals: gold,iron, coal... I forgot the rest. Google it... I am sure you will find it there. I Google everything from homework to gossip. Good Luck!