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Section 18.2 Intrusive Activity
Main Idea
(continued)
Details
Compare a sill and a dike. Place each characteristic below in the
Venn diagram to show whether it is a characteristic of a sill, a dike,
or both.
• cuts across preexisting rocks
• is parallel to the rocks it intrudes
• is a few centimeters to hundreds of meters thick
• many are coarse grained
• is a few centimeters to several meters wide
• is a pluton
Sill
Plutons and
Tectonics
Use with page 478.
Both
Dike
Sequence the four steps involved in forming batholiths from
mountain-building processes. The first step has been completed for you.
Two continental plates converge,
forcing continental crust into the mantle.
OR
Two oceanic plates converge and
one plate is subducted into the mantle.
Volcanic Activity
207