A nonrenewable resource<span> is a </span>resource<span> of economic value that cannot be readily replaced by natural means on a level equal to its consumption. Most fossil fuels, such as oil, natural gas and coal are considered </span>nonrenewable resources<span> in that their use is not sustainable because their formation takes billions of years.</span>
Well, the magma in the volcano is boiling... and boiling... and boiling, until, it finally expands enough to erupt.
c.polluting a river because u are contaminating the water
