4. What do you call the circular patterns in which the world’s oceans travel?

In each ocean basin there is a roughly circular current flow called a gyre. The world's oceans travel in well-defined circular patterns called currents which flow like rivers.

Explanation:

the answer is underlined and in bold

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."