The answer would be the average number of people in a given area.
<span>This is a composite volcano. In contrast to shield volcanoes, these tend to have a much steeper structure that is formed from those levels of lava. Shield volcanoes are much more like their name implies: a wider and flatter structure, like that of a warrior's shield.</span>
A flat plain that is formed on the seabed where a river deposits material over many years would be specified as a Delta.
