clast-, clas-, -clastic, -clast, -clase, -clasia, -clasis, -clasis, -clasmic, -clasm

(Greek: break, break in pieces; broken, broken in pieces, crush; bend)

1. Composed chiefly of rock fragments of volcanic origin.
2. A churning cauldron or a pyroclastic flow.

There's an explosive arc, reminiscent of the way a solar flare arcs up and then collapses with a splash.

Composed chiefly of rock fragments of explosive origin, especially those associated with explosive volcanic eruptions.

Volcanic ash, obsidian, and pumice are examples of pyroclastic materials.

A reference to a composition made up chiefly of fragments of volcanic origin.
synclastic (adjective)
1. Curved toward the same side in all directions; said of surfaces which in all directions around any point bend away from a tangent plane toward the same side, as the surface of a sphere; opposed to anticlastic.
2. Property of a surface or portion of a surface for which the centers of curvature of the principal sections at each point lie on the same side of the surface.
The fracture or breaking of hair because of brittleness.
Composed chiefly of fragments of volcanic origin, as agglomerate, tuff, and certain other rocks; pyroclastic.

Related break, broken-word units: frag-; rupt-.