Columnar jointing forms primarily because of __________
A)Contraction and cracking of rock during the cooling process
B)Changes in density of the material as it cools
C)Partial remelting of lava on the surface
D)Fragmentation of the rock due to volatile escape

Question

Quizplus · Accepted Answer

Columnar jointing occurs when lava or magma cools and contracts, causing cracks to form and split the rock into long, hexagonal (or sometimes pentagonal) columns. This process is similar to how mud can crack when it dries. So, the primary reason for columnar jointing is contraction and cracking of rock during the cooling process.

Columnar Jointing Forms Primarily Because of __________