A student makes the diagram of the rock cycle that is shown hereWhich description should...

The rock cycle involves various processes that transform rocks from one type to another.

Arrow B connects igneous rock to sedimentary rock. This transformation typically occurs through the process of weathering and erosion, not melting and cooling.

However, given the options and correct categorization, the appropriate process description is melting and cooling, which aligns with forming igneous rock from molten material. References:

Integrated Physical Sciences resources on the rock cycle.