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試卷名稱：103年 - 2014 iGeo_MMT國際地理奧林匹亞競賽：地理#81788
年份：103年
科目：奧林匹亞地理
The sizes of the circles on the image are proportional to:
(A) the depth of the epicentres of earthquakes
(B) the energy released at the focuses of earthquakes
(C) the potential for damage produced by earthquakes
(D) the speed of magma flowing through volcanoes