Because each of them represents an entire layer that has a unique composition and state compared to the other two. For instance, the crust is made up of specific minerals in specific quantities, and is cool and solid, because of it's exposure to space. Because centripetal force keeps all the mass of the planet moving inward while it spins, there is a tremendous heat and pressure on the lower layers, eventually turning solid rock into liquid magma. That's when the mantle begins. FInally, the pressure is so great that there is no choice but for the magma to solidify again into the hard nickel core.
The Core, mantle, and crust.
The lithosphere (which is composed of the crust and solid brittle upper mantle) makes up the Earth's tectonic plates.
Yes
The layer just below Earth's crust is the mantle. It is the thickest layer, and is composed of flowing rock material. The solid upper part of the mantle joins with the crust to form the lithosphere
These are the crust, mantle, and core. However, there is a distinct inner and outer core and a less distinct inner and outer mantle. There is also different types of crust so there are as many as 7 or 8 layers in the Earth's crust.
Crust, mantle, inner core and outer core
There three basic part of earth are The crust The mantle The core
The core, mantle and the crust. (There is an inner and outer core, and an inner and outer mantle.)
the three parts of the earth are: 1. the crust 2. the mantle and 3. the core
crust mantle core
crust mantle core
They are all parts of the Earth.
crust mantle core
crust,mantle,and core.
Core, Mantle, Crust
The Core, mantle, and crust.
The three parts that make up the Earths mantle are the crust, core, and mantle.