Here's why:
* Igneous rocks form from the cooling and solidification of magma (underground) or lava (above ground).
* Intrusive refers to the fact that the magma solidified underground, before reaching the surface.
* Irregularly shaped simply means that the solidified magma didn't form in a predictable or consistent shape.
Some examples of irregularly shaped intrusive igneous rocks include:
* Batholiths: Large, irregularly shaped intrusions of granite.
* Stocks: Smaller, irregular-shaped intrusions of granite, often associated with batholiths.
* Dikes: Vertical or near-vertical sheets of magma that cut across existing rock layers.
* Sills: Horizontal sheets of magma that intrude between existing rock layers.
These irregular shapes are often caused by the complex interactions between the magma and the surrounding rock as it cools and solidifies.
