being composed of minerals and chrystals and being hard as hell
A rock is a complex mixture of compounds, not a pure substance.
Substance that made up it's surface
A measure of how a substance absorbs and reflects light
iTunes defines Flyleaf as "rock." Personally, I would consider them a hard rock band.
specific gravity
This is a catalyst
Substance is important because it defines the essential character or nature of something. It provides the foundation on which things are built or developed. Without substance, things lack depth, meaning, or value.
It is a pure substance, because it has other compounds to it.
It is a pure substance, because it has other compounds to it.
Rock salt contains all the minerals found in the seawater from which it formed. These will be many, but NaCl will be the main one.
they thought rock and roll lacked substance
rock