Which feature listed below would you find the most difficult to identify and why?

dike





sill





laccolith





batholith|||A laccolith.





Laccoliths are a type of intrusive igneous formation, also called "plutonic formations" or "igneous intrusions". This means that they were formed as magma cooled beneath the surface. With laccoliths the magma moves into an area beneath the ground, causing the overlying rock layers to dome upward. After the magma crystallizes into solid rock, it is exposed as the less durable rock above erodes away.





Because of this, it is often difficult to determine what it is that you're looking at. For instance, Devil's Tower in Wyoming was thought to be a volcanic neck, but further study has show it to be an eroded laccolith.