Question

according to the principle of crosscutting relationships, what can we determine about intrusions or breaks in rock layers?

they are older than the rock they cut across

they are the same age as the rock they cut across

they are younger than the rock they cut across

their age cannot be determined relative to the rock they cut across

Explanation:

The principle of cross - cutting relationships in geology states that if one geological feature cuts across another, the feature that is cut is older. Intrusions or breaks (like faults) in rock layers are the features that do the cutting. So, they must be younger than the rock layers they cut across.

Answer:

They are younger than the rock they cut across.