In the figure provided below,what type of igneous intrusion is the horizontal rock unit shown by letter A?
A)dike
B)sill
C)pluton
D)laccolith

Question

In the figure provided below,what type of igneous intrusion is the horizontal rock unit shown by letter A? 
A)dike 
B)sill 
C)pluton 
D)laccolith

Quizplus · Accepted Answer

The horizontal rock unit shown by letter A is a sill, which is a type of igneous intrusion that occurs when magma is injected parallel to existing layers or bedding planes in the host rock. Sills have a tabular, sheet-like shape and are generally uniform in thickness. They are often found sandwiched between layers of sedimentary rock, which is consistent with the diagram provided.

In the Figure Provided Below,what Type of Igneous Intrusion Is