What are two types of pure substances ? what is the difference between the two ?

The main difference between an element and a compound is that an element is made up of the same type of atom throughout while a compound is composed of multiple different elements. Both are pure chemical substances found in nature.

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.