Kid Dictionary Volcanic Eruption. When a volcano erupts hot gases and melted rock from deep within earth find their way up to the surface. Andesite is a type of volcanic rock.
The base of the crater then sinks leaving a caldera where the top of the volcano was before. Volcanic bombs range in size from 2 5 in 64 mm to several yards meters in diameter and can weigh several tons. A mass of molten lava that is ejected during a pyroclastic explosion and hardens in the air.
The base of the crater then sinks leaving a caldera where the top of the volcano was before.
When a volcano erupts hot gases and melted rock from deep within earth find their way up to the surface. This gray to black rock is composed of about 54 to 62 percent silica sio 2 plus some iron and magnesium. Try the world s fastest smartest dictionary. Volcanic eruptions may be very destructive.