Why isn't the earth homogeneous?

Question

Why isn't the earth homogeneous? I just need a quick, good answer.

Answer 1

Because the ground you walk on is very wearable.

If it was homogeneous . .

the world would eventually wear away to nothing . .

Hope this helped . .

kind of a vague question.

Answer 2

Not everything has the same stability for the conditions, and things tend to migrate to where they are more stable.  Energy wants to minimize.  This differential migration in response to conditions separates things and leads to inhomogeneity.

Energy flows downhill, in a sense, and the earth is still rolling down that hill.  It is that simple.

Answer 3

In early stages of the Earth's formation about 4.5 billion  years ago, melting would have caused denser substances to sink toward the center in a process called planetary differentiation, while less-dense materials would have migrated to the crust. The core is thus believed to largely be composed of iron, along with nickel and one or more light elements, whereas other dense elements, such as lead and uranium, either are too rare to be significant or tend to bind to lighter elements and thus remain in the crust

Answer 4

Different processes conspire in different areas to produce different topographies.

For instance, heavy elements sink to the core of the Earth.  Lighter elements are above that and the lightest elements make up the crust of the earth.

Erosion moves material from areas above waterline to areas below waterline.

Plate tectonics moves the mantle plates, with continents floating on top, from spreading centers to subduction interfaces and in the process creates mountains and trenches.

Biological processes create coral reefs in one location and not in another.