Which condition causes ocean water salinity to decrease?
a. freezing of polar ice caps
b. high levels of evaporation
c. river water flowing out into the ocean
d. low levels of precipitation

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."