Question

the photograph shows hexagonal basalt columns on a mountain that formed from a volcanic eruption in iceland. which of the following is mostly likely true of the lava that formed these columns?
a) it flowed very quickly.
b) it was very thick.
c) it cooled very slowly.
d) it solidified underground.

Explanation:

Hexagonal basalt columns form when lava cools slowly. Slow - cooling allows minerals to arrange in a regular, hexagonal pattern. Quick - flowing lava would not have time for such orderly formation. Thick lava doesn't directly relate to the hexagonal column formation. Lava that solidifies underground forms different types of igneous rocks and not these surface - exposed columns.

Answer:

C. It cooled very slowly.