Which of the following would be an example of weathering?

Rain washing away soil from a hillside and Flood water pouding against a canyon wall and wearing it down

its been noted for the past decade or so that there is some (approximately 5% to 7%) shrinkage in the brains of people who have schizophrenia, most notably in the gray matter, which is an important part structures in the brain’s amygdala, hippocampus and parahippocampus, which are all involved in memory storage and retrieval memory storage and retrieval.

explanation:

ive read articles

not sure if this what   you'r looking for would be percent composition