It depends upon what kind of hammer you have. You probably need to have a gold hammer to do the job. A silver hammer can't do it. Trust me, I've tried and killed myself.
erosion can break rocks apart, weathering can also break rocks apart
Yes , Rocks Can Break Your Back .
rocks can break if you freeze and thaw it
sunlight does not break down rocks
Some rocks can be shattered.
All weather can and will break up rocks.
You can break rocks by using the move Rock Smash.
You use the hammer either from tanya's shop or the one Gordon gives you and attack the rocks to smash them
the process is called weathering when the rocks break down
Plants roots are surprisingly strong. They can break into rocks with there roots and break them apart.
Strong winds pick up patricles of dust and sand as they blow. These particles scartch the surface of rocks. As the rocks are repeatedly scratched, they slowly wear away. Rocks weathered by wind change shapes. Some look like natural bridges while others look strange. Rocks weathered by wind may change in shape but the composition of the rocks remains the same. Hope that answered your question.
Nothing can, if you try to twist rocks, you just break the rocks to form smaller rocks.