The difference is primary happens naturally and the secondary responds to an disturbance.
Option A, a fault is always younger than the rock it cuts through
Reason:
Basically there are three modes of determining the age of rock
1) In a sedimentary rock, the layer at the bottom is the oldest. It is called as law of super position
2) If a rock layers lies below an extrusion, then it is always older than the extrusion
3)a fault is always younger than the rock it cuts through
Hydrogen
followed by carbon, oxygen, and then nitrogen.
Answer is in the file below
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