What is the Difference Between Similar But Different Things, Terms, and Objects

What is the Difference between Lava and Magma

The earth’s core is not the same as its crust looks. Earth has three layers, core, mental and crust. In the core there are molten rocks no solid rocks or solid material can be found there. Then comes mental or the middle part of the earth which is also hot but not that hot like core and then come the crust.