Structure and Processes of Earth

Pick up an ordinary stone from the ground, and you are holding a fragment of a colossal, churning thermal engine. The solid earth beneath our feet is not a permanent, static stage; it is merely the hardened, transient rind of a spherical machine that has been continuously recycling its own surface for over four billion years. To understand Earth science is to recognize that mountains, oceans, and atmospheric gases are not distinct, isolated phenomena. Rather, they are deeply interconnected systems in constant motion, driven by the profound heat radiating from the planet's core and the radiant energy pouring in from our Sun.

Understanding the architecture and processes of our planet requires us to look at Earth through two different lenses: what it is made of (its chemical composition) and how it behaves (its mechanical properties).