Molten rock can either be an “inny,” intruded into another rock, or an “outty,” extruded onto the surface of the earth. Just ...

That sculpted the rock, giving it the shape we can see today. ISLA: That’s right. It’s also an igneous intrusive feature, just like them. The rock they’re made of is called phonolite - also ...

THE Andean Mountain system in Peru has experienced extensive igneous activity, a significant portion of which was intrusive. A principal feature of this part of the Andes is the coastal batholith ...