The dark igneous features shown in this photograph are:
A)dikes
B)sills
C)volcanic necks
D)batholiths

Question

The dark igneous features shown in this photograph are: 
A)dikes 
B)sills 
C)volcanic necks 
D)batholiths

Quizplus · Accepted Answer

The dark igneous features that are shown in the photograph are close to horizontal and are cutting through the surrounding rock layers. This is characteristic of sills, which are intrusive igneous features that are formed when magma is injected parallel to the bedding planes of the surrounding rocks and solidifies underground. Di kes and volcanic necks are also intrusive features, but they typically cut through the rocks in a more vertical direction. Batholiths, on the other hand, are much larger intrusive features that cover an area of at least 100 km2, which is not evident from the photograph. Therefore, the best choice is B, sills.

The Dark Igneous Features Shown in This Photograph Are