Composite Volcanoes
Composite volcanoes also called stratovolcanoes they are exact the opposite of shield volcanoes being tall and conical. These types of volcanoes occur at destructive plate boundaries and the lava that spews out of the is very viscous. Because it's very thick the lava won't flow very from away from the volcanoe's vent. This in turn makes the sides of the volcano vey steep.

This volcano erupts very violently, because of the thickness of the lava it doesn't move far and dries blocking the way outside. As the lava dries the pressure starts to build up and when there's enough lava to supply an eruption its erupts.

On composite volcanoes there are also parasitic cones or secondary cones where a smaller eruption can occur if the main vent blows up.

A composite volcano