Tabular sills and lava flows often have regular geometric grids of vertically oriented, thermal shrinkage cracks called ________.
A)arthritic joints
B)columnar joints
C)hot flashes
D)honeycomb fractures

Question

Quizplus · Accepted Answer

The regular geometric grids of vertically oriented, thermal shrinkage cracks are called columnar joints, which commonly occur in tabular sills and lava flows. Arthritic joints, hot flashes, and honeycomb fractures are not related to this geological feature.

Tabular Sills and Lava Flows Often Have Regular Geometric Grids