Question

Which of the following is the factor involved in the dynamics of rivers carvings canyons in rocks?
A.weathering
B.tectonic movement
C.Molten rock formation
D.Metamorphic rock formation

Answer 1

I'd say A, but I'm not very sure.

Answer 2

I believe the answer is B. tectonic movement. 

When the tectonic plates collide, the uplifted land is then cut through by rivers.

I hope this helps!