What is meant by the statement weathering combines the processes of destruction and synthesis? Give an example of these two processes in the weathering of a primary mineral. Give an example of how...

What is meant by the statement weathering combines the processes of destruction and synthesis? Give an example of these two processes in the weathering of a primary mineral.

Give an example of how parent material may vary across large geographic regions on one hand, but may also vary within a small parcel of land on the other.