Afast-moving flow consisting of a mixture of water and volcaniclastic debris is termed a

A fast-moving flow consisting of a mixture of water and volcaniclastic debris is lahar. It is a kind of mudflow that is made up of materials that flow down a volcano. It has the consistency of wet concrete but they go down volcanoes at rapid speeds.

C.about 10% i think

Argon, carbon-14, and carbon-12