Hot magma or lava.
Igneous rock is formed through the rock cycle. The igneous rock is formed by magma and lava,then it goes through volcanic activity.
there's a Latin word called "igneus" which means fire and the igneous rock is formed by lava, but that's a different subject.
igneous rock has its name because over 100 years ago a guy named igneous (greek legond) found a rock that hadn't been named or found yet and he named it after his self
An intrusive igneous rock forms inside the volcano and an extrusive forms outside a volcano