Here's a breakdown of the Earth's layers:

* Crust: The outermost layer, thin and rocky, made up of continental and oceanic crust.

* Mantle: The thickest layer, made up of mostly solid rock that flows slowly over very long periods.

* Outer Core: A liquid layer composed primarily of iron and nickel.

* Inner Core: A solid ball of iron and nickel, incredibly hot and dense.

So, while the "Geosphere" refers to the entire interior, you might also hear people refer to specific layers like the "mantle" or "core."