Why is Earth’s crust layered?

What Causes the Layering of the Earth's Crust?

Earth’s formation 4.2 billion years ago led to the development of surface rocks with a layered composition, as hot rocks from the planet’s interior cooled and crystals accumulated over millions of years. The geological evidence of continental crust formation comes from ancient crustal blocks known as krathong. These blocks, called cratons, are billions of years [...]

Why is Earth’s crust layered?

Researchers found that the enrichment of radiogenic elements in the upper continental crust requires high-temperature metamorphism to melt minerals in the lower continental crust.