Matching Rock Weathering and Geological Terms

This question requires matching geological terms from Column I with their definitions in Column II. Let's analyze each item:

• A: The peeling away of layers or sheets of rock
  This process, where layers of rock detach like an onion's skin, is known as Exfoliation. It is a common form of weathering caused by pressure release or thermal expansion and contraction. This matches term R.
• B: The interface between weathered material and unweathered bed rock
  This boundary defines the depth to which weathering has progressed into the solid rock. It is referred to as the Weathering front. This matches term U.
• C: The uncovering of surfaces beneath regolith or younger geological material
  This describes the process where buried rocks or surfaces are exposed due to erosion or uplift. This is the definition of Exhumation. This matches term Q.
• D: Dark staining of rock surface in arid regions
  The dark coating often found on rocks in dry environments, formed by mineral and potentially microbial activity, is called Rock varnish. This matches term T.

Final Match

Based on the analysis:

• A matches R (Exfoliation)
• B matches U (Weathering front)
• C matches Q (Exhumation)
• D matches T (Rock varnish)

Therefore, the correct combination is A - R, B - U, C - Q, D - T.