1.

S1: We now know that the oceans are very deep.P : For example, the Indian ocean has a range called the Indian Ridge.Q : Much of it is fairly flat.R : However, there are great mountain ranges as well.S : On average the bottom is 2.5 miles to 3.5 miles down.S6: This reaches from the India to the Antarctic.The Proper sequence should be:

A. QPR
B. QSR
C. SQP
D. PRS
Answer» B. QSR


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