1. 18.3 – Intrusive Activity

2. Plutons
Intrusive igneous rock body, including __________, ________,sills & dikes
Formed through ___________-building processes and ___________-oceanic collisions
Can be __________ at Earth’s surface to uplift and erosion

3. Batholiths & Stocks The _______ plutons are called Batholiths.
Batholiths are _________-grained, irregularly shaped, igneous rock mass that covers at least ________ km2
Stocks are ___________ shaped plutons but ___________ in size.
Both generally form 5-______ km below Earth’s surface and are _________ in the interior of major _____________ chains

4. Laccoliths Relatively _____________
____________-shaped pluton that forms when magma ___________ into parallel rock layers ________ to Earth’s surface
Laccoliths have
________ bottoms
and ___________
tops.

5. Sills
Pluton that forms when magma ________ parallel rock ______________

6. Dikes
Pluton that cuts __________ preexisting rocks and often forms when magma ____________ cracks in surrounding rock ____________

7. Plutons & Tectonics
____________ plutons form as the result of _____________-building processes.
Plutons are thought to form as a result of _________________-continental and ___________-continental convergence.

8. Reinforcement
T/F
Batholiths are common in the interiors of mountain chains.
Laccoliths have curved bottoms and flat tops.
Sills form when magma is forced between rock layers.
Most igneous activity occurs deep within earth.