The principle of ______ states that fragments included in a host rock must be _______ than the host rock.

Question

Quizplus · Accepted Answer

The principle of inclusion states that fragments (or inclusions) included in a host rock must be older than the host rock itself. This is because the inclusion must have formed first in order to be incorporated into the host rock. The principle of intrusion states that a rock body (or intrusion) must be younger than the rocks it intrudes upon. This is because the intrusion must have formed and then pushed its way into pre-existing rocks. Therefore, A, C, D, and E are all incorrect.

The Principle of ______ States That Fragments Included in a Host