sentence: Intrusive volcanism is when magma is forced into the rocks that make up the Earth's crust.
sentences_after: It occurs when there are lines of weakness such as faults, joints, or bedding planes in the crust. Then magma enters these lines of weakness. When it cools and become solid while still underground, different features called plutons are formed. The rock formed is intrusive igneous rock.
concept_name: intrusive volcanism
headings: Volcanism Aspects Intrusions
categories: Volcanology