The Intellectual Devotional: Revive Your Mind, Complete Your Education, and Roam Confidently with the Culture (The Intellectual Devotional Series)

by David S. Kidder

The crust of the earth is made of several plates, fifty miles thick, which move slowly over the earth’s molten core, like ice on a frozen pond. When two plates pull apart, collide, or rub against each other, the result is an earthquake.