Question

Which discordant body is columnar or column shaped?

(a) Dykes

(b) Volcanic necks

(c) Bysmaliths

(d) Batholiths

The question was asked in an international level competition.

I need to ask this question from Forms of Igneous Rocks in chapter The Study of Rocks of Engineering Geology

Answer 1

Correct choice is (a) Dykes

For explanation I would say: Dykes may be defined as columnar bodies of igneous rocks that cut across the bedding plane or uncoformities or cleavage planes and similar structures.