What is the main difference between primary and secondary succession? Primary succession involves plants and secondary involves animals.
Primary succession happens after secondary succession.
Primary succession starts with bare rock and secondary starts with soil.
Primary succession happens after a natural disaster and secondary doesn't.

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."

yes, because even though a theory has a  lot of evidence to support it, it is not always true

i think it is a but you should pick diferently if you think it is somthing else