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【正文】 entually mergewith East Asia. This hypothesis is based on the direction the Americas are moving innow. But others hypothesize that a new super continent will form in a different think that a new subduction zone will might occur at the western edge of theAtlantic Ocean. Paul can you remind us what a subduction zone is Student Yeah. Um...basically a subduction zone is where two tectonic plates if an ocean floor tectonic plate meets the edge of a continent and they pushagainst each other the heavier one sinks down and goes under the other one. Sothe um...the oceanic plate is made of denser and heavier rock so it begins to sinkdown under the continental plate and into the mantle. Professor Right. So the ocean floor would kind of slide under the edge of the once the ocean plate begins to sink it would be affected by another force –slab pull. Slab pull happens at the subduction zone. So to continue our example. As the ocean floor plate begins to sink downinto the mantle it would drag or pull the entire plate along with it. So more andmore of this plate the ocean floor would go down under the continent into themantle. OK So as I said currently the Atlantic Ocean floor is spreading getting wider butsome researchers speculate that eventually a subduction zone will occur wherethe oceanic plate meets the continental plate of the Americas. If that happensslab pull could draw the oceanic crust under the continent actually causing theAmericas to move eastward toward Europe and the ocean floor to get is the Atlantic Ocean would start to close up narrowing the distancebetween the eastern edge of the Americas and Europe and Africa. So they forma single super continent. Conversation 2 Credits for Internship Narrator Listen to a conversation between a student and an employee at theuniversity center for offcampus study. Student Hi. I am Tom Arnold. I am supposed to pick up a packet from the regionalcenter for marine research. I am doing an internship there this summer. Employee Yes. I have it right here. The mail carrier dropped it off a few minutes ago. Student Thanks. Um...l wanted to ask about getting credits for the internship. I dontknow if… Employee I might be able to help you with that. Is there a problem Student I just wanted to make sure the details have been corrected. The systemshould show that I am registered to earn four credits. But as of Friday nothing wasshowing up yet. I was told it would be fixed this morning. Employee Well I can check on the puter for you. Tom Arnold right Student Yes. Employee Well it is showing credits but only three. Student Really So now what These all have to be finalized last week. Employee Well yes. The course enrollment period ended last week. But since our officewas supposed to get this straightened out for you before then... Let me see what Ican do. Uh...did the university give approval for you to earn four credits for thisinternship Because the other students at the center for marine research are onlygetting three. Student Um...l am pretty sure those other students
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