* Density: Continental crust is less dense than oceanic crust. This is primarily because continental crust is made up of a higher proportion of lighter minerals like granite and feldspar, while oceanic crust is composed mostly of denser minerals like basalt and gabbro.
* Thickness: Continental crust is significantly thicker than oceanic crust. The average thickness of continental crust is around 35 km, while oceanic crust is typically only around 7 km thick.
* Isostatic Equilibrium: The Earth's crust and upper mantle are in a state of isostatic equilibrium. This means that the crust "floats" on the denser mantle, much like a block of wood floats on water. The deeper the crust extends into the mantle, the more buoyant it becomes. Since continental crust is thicker and less dense, it displaces more mantle material and therefore floats higher.
Here's a simple analogy: Imagine a wooden plank floating on water. A thicker plank will displace more water and sit higher than a thinner plank. Similarly, the thicker and less dense continental crust displaces more mantle material and sits higher than the thinner and denser oceanic crust.
This difference in elevation is why continents sit above sea level, while ocean basins are submerged. The higher elevation of continents also creates the possibility for mountain ranges to form due to tectonic forces.
