Igneous+Intrusions

__Igneous Intrusions__ : pluton - igneous rock that hardens underground sill - igneous intrusion the forms between rock layers dike - igneous intrusion that cuts across rock layers laccolith - a mushroom shaped igneous intrusion batholith - largest of all plutons - unknown size - makes up the core of mountains stock - small batholith less than 100 square kilometers neck - the remnants of the hardened lava in the throat of a volcano after erosion