Icebergs, such as this dry dock in the Labrador Sea, present special concerns to marine shipping and hydrocarbon exploration along Canada's east coast. This photograph illustrates several phenomena: a smooth surface characteristic of previous underwater exposure, recent spalling of the front face, undercutting or notching by waves at the waterline, and the presence of underwater rams (seen on the right and inferred on the left). See page 1333. [Petro-Canada Resources, Calgary, Alberta T2P 3E3, Canada]

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