What is a stone in the river?

I read this online...

Weathering is a process of breaking up rock materials under the influence of air and water. It designs the Earth's surface by shaping it through different physical and chemical processes. Each of these processes has a different effect on rocks and their minerals, and different rocks react differently to weathering, depending on their structure.

What effects have the processes of life had on you and what has been your reaction?
I imagine our answers depend on our structure, how we are built. Our structure is the difference between life's processes making us brittle or polished.