Question

which feature causes a gap in the geologic record?
extrusion
fault
intrusion
erosion

Explanation:

Erosion can wear away rock layers, removing parts of the geologic record. Extrusion (lava flow) and intrusion (magma pushing into rock) add to the record. A fault is a break in rock but doesn't directly cause a gap like erosion does by removing material. So erosion is the feature that causes a gap in the geologic record.

Answer:

D. erosion