Earth's crust in constant motion from "summary" of Principles of Geology, Volume 1 by Charles Lyell,Sir Charles Lyell
The Earth's crust is in a state of constant motion, a fact abundantly evidenced by the geological phenomena around us. When we carefully observe the surface of the Earth, we can see that it is not fixed and unchanging, but rather dynamic and ever-changing. Mountains rise and fall, continents drift apart, and earthquakes shake the ground beneath our feet. This movement of the Earth's crust is driven by the forces operating deep beneath the surface. The heat generated by the Earth's core causes the rock in the mantle to flow in a process known as convection. This movement of molten rock creates a force that pushes and pulls on the overlying crust, causing it to move and shift over time. One of the most striking examples of this movement is the theory of plate tectonics. According to this the...
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