When magma cools and solidifies in these spaces, Intrusive or plutonic igneous rocks are formed deep beneath the Earth's surface. Intrusive features like stocks, laccoliths, sills, and d-i-k-e-s are formed.
Magma sits in reservoirs called magma chambers, it finds it way through various paths towards the surfaces, where it cools down.
When it cools down beneath Earth's surface, while in the magma chambers for example or on the paths leading to the surface, it creates intrusive features are form: stocks, laccolithes, d ikes and sills.
If the lava solidifies under ground in a pathway and then collapses, that would form a lava tube or a cave.
