Loading...
A study published by Rice University geoscientist Ming Tang in 2019 offers a new explanation for the origin of Earth's structures called arcs, towering ridges that form when a dense oceanic plate subducts under a less dense continental plate, melts in the mantle below, and then rises and bursts through the continental crust above. According to the study, these arcs are significant features of ________ formations that have puzzled scientists for years.<br/><br/>Which choice completes the text so that it conforms to the conventions of Standard English?