What is the term for the process of cracking that occurs when folded land can no longer bend?

The term for the process of cracking that occurs when folded land can no longer bend is faulting. Faulting happens when the stress on the Earth's crust exceeds its strength, leading to a fracture or break. This can occur in areas where the rock layers have been subjected to significant tectonic forces, causing them to deform. When these layers reach their limit and can no longer fold, they break along a fault line, resulting in the movement of the earth on either side of the crack.

In contrast, folding refers to the bending of rock layers due to compressional forces, which occurs before faulting in many geological scenarios. Diastrophism is a broader term that encompasses both folding and faulting as part of the deformation of the Earth's crust. Compression is the process that leads to both folding and faulting but does not specify the resulting fracture or break in the rock. Therefore, the most accurate term for the process described in the question is faulting.