crust

The first layer of the earth, about 10 miles deep of materials, that we exist on. 


Source
http://idahoptv.org/sciencetrek/topics/rocks_and_minerals/facts.cfm

Igneous rock

A rock that is formed when lava cools. The Earth's crust is 95% Igneous rock.


Source
https://www.flickr.com/photos/jsjgeology/16574030439

mantle

The mantle is below the Crust, and is made of rocky substance. It is about 85% of the total  Earth's weight.


Source
http://idahoptv.org/sciencetrek/topics/rocks_and_minerals/facts.cfm

molten

An object that is becomes a liquid form by heating. 


Source
https://upload.wikimedia.org/wikipedia/commons/a/a4/Eruption_1954_Kilauea_Volcano.jpg