03-09-2023, 04:52 PM
(This post was last modified: 03-09-2023, 04:54 PM by RockyRaab2.)
At the other end of the temp scale the fast/slow and small/large grain process also occurs in lava. If you've ever noticed the octagonal columns of basalt just south of Pocatello along I-15, that's the result of slow cooling.