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Presents a review of studies that confirm an internal instability and other rapid changes in the West Antarctic Ice Sheet (WAIS). Changes due to combination of delayed response to end of last global glacial cycle and internal instability; Ongoing changes in ice stream B and ice stream C; Details on cause for changes; Near-future impact on global sea level; Effect of possible greenhouse warming.

Tests several theories on ice-stream mechanisms in Antarctica. Description of the crevasse opening and the behavior of crease bridges; Study of a feature on an interstream ridge that may be relic from a formerly different ice-stream flow.

Describes the surveying of a strain grid in the vicinity of an ice stream in Antarctica using the Global Positioning System receivers and Sky-Doos. Relative elevations; Concern on whether sites of drag or variations in ice type are being advected with flow or are fixed with respect of the bed.