Which of the following is a significant cause of physical weathering?
a.
moving water
b.
frozen water
c.
wind
d.
all of these

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a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

answerthe above question is correct(true) hope this ;