claim: Granite is a solid.
evidence: Igneous rock -LRB- derived from the Latin word ignis meaning fire -RRB- , or magmatic rock , is one of the three main rock types , the others being sedimentary and metamorphic .. Latin. Latin. rock types. The three types of rocks. sedimentary. Sedimentary rock. metamorphic. metamorphic rock. Igneous rock is formed through the cooling and solidification of magma or lava .. magma. magma. lava. lava. The magma can be derived from partial melts of existing rocks in either a planet 's mantle or crust .. magma. magma. partial melts. Partial melting. planet. Terrestrial planet. mantle. mantle ( geology ). crust. crust ( geology ). Typically , the melting is caused by one or more of three processes  : an increase in temperature , a decrease in pressure , or a change in composition .. temperature. temperature. pressure. pressure. Solidification into rock occurs either below the surface as intrusive rocks or on the surface as extrusive rocks .. intrusive. Intrusion. extrusive. extrusive ( geology ). Igneous rock may form with crystallization to form granular , crystalline rocks , or without crystallization to form natural glasses .. crystallization. crystallization