The classical period is between the baroque and romantic periods. This means that music from the classical period is music composed between about 1750 to 1820. It is important to note that the classical period ended before Beethoven died. This is because Beethoven was the one who ended it!
<span> 84 billion cubic meters per year</span>
The answer to the question is the total surface area increases and chemical composition changes. Consider the breakdown of rock into smaller pieces, these fragments vary from huge rocks to smaller sizes. As they are so crushed and broken they tend to occupy much of the surface area than when its just a huge rock.