... Ice Shelf in late 19 87 and measured about 100 miles long, 25 miles wide, and 75 0 feet thick, about twice the size of Rhode Island In August 1989, it collided with 1 97 Marine Geology Figure 148 ... techniques can map the ocean bottom, where a large potential for the world’s future supply of minerals and energy exists 211 Marine Geology Figure 1 57 The location of ore deposits originally formed ... storm surges Figure 145 The subsidence of sediments (right) by the withdrawal of fluids 193 Marine Geology MARINE TRANSGRESSION Sea levels have risen and fallen many times throughout geologic history...