A natural resource is described as non-renewable or exhaustible when its speed of destruction exceeds, largely or not, its speed of creation. Thus a soil is formed in a few centuries to several millennia according to the chemical, physical and biological conditions and is currently destroyed in certain regions in a few decades, even a few years. It is also possible to compare the current accelerated destruction of species with the use of non-renewable resources.
A molecule is formed when two or more atoms<span> join together chemically. A compound is a molecule that contains at least two different </span>elements<span>. All compounds are molecules but not all molecules are compounds.
