Here's a breakdown:
* Intrusive igneous rock: This means the rock formed from magma that cooled and solidified beneath the Earth's surface.
* Domelike mass: This refers to the shape of the intrusion, which is typically rounded or bulging upwards.
* Laccolith: This is the specific geological term for such a formation.
Laccoliths are formed when magma intrudes into layers of sedimentary rock, pushing the overlying layers upwards to create a dome-like structure. They are often associated with volcanic activity and can be found in various parts of the world.