Question

_______ magma causes powerful and explosive volcanic eruptions. A. Basaltic B. Andesitic C. Rhyolitic D. Composite

Answer 1

Rhyolitic is the answer ;)

Answer 2

An explosive eruption always begins with some form of blockage in the crater of a volcano that prevents the release of gases trapped in highly viscous andesitic or rhyolitic magma. The high viscosity of these forms of magma prevents the release of trapped gases. When this type of magma flows towards the surface pressure builds, eventually causing the blockage to be blasted out in an explosive eruption. The pressure from the magma and gases are released through the weakest point in the cone. http://en.wikipedia.org/wiki/Explosive_eruption hers the source. i hope this helped in any kind of way :)

Answer 3

hears*