These are called intrusive igneous rocks because the magma has intruded into pre-exiting rock layers. Types of intrusive igneous rocks are granite and basalt .
A batholith is the largest of the intrusive bodies.
A database that contains multiple tables related through common fields.
A common field is a field of data that is shared among all forms in a database. Without them, it would be difficult and/or time-consuming to create other forms.