Which situation involves shear?A.Isolated rift valleysB.Frequent shallow earthquakesC.Convergent boundariesD.New rock formationsE.Volcanic mountain ranges

To determine which situation involves shear, we can analyze each option based on geological principles:

1. Isolated rift valleys: These typically occur due to divergent boundaries where tectonic plates are pulling apart. The dominant force here is tension, not shear.

2. Frequent shallow earthquakes: Shallow earthquakes often occur in regions where tectonic plates interact. Shear stress can be a factor here but is not exclusively indicative of shear alone.

3. Convergent boundaries: At convergent boundaries, tectonic plates collide. The intense pressure and friction between the plates generate shear stress as one plate slips past another.

4. New rock formations: New rock formations can result from various geological processes, including sedimentation, but do not inherently involve shear forces.

5. Volcanic mountain ranges: These formations result from the movement of magma and tectonic activity. While there may be some shear forces involved, they are not the primary characteristic of volcanic activity.

Based on this analysis, the option that most directly involves shear stress from tectonic activity is:

C. Convergent boundaries