The first seismic waves to arrive at the scismeic station are what

the answer is a or when it says crossing over

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it's c. (to reduce the greenhouse effect/carbon gasses)

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."