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 downS6:This reaches from the India to the Antarctic.The Proper sequence should be:

A. RSQP
B. SQPR
C. PQSR
D. QPRS
Answer» C. PQSR


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