The proposal by Molnar and England (1990) that links climate change, weathering, erosion, and isostatic rebound in a feedback system is in itself the beginning of a fruitful research program that promises to enlarge our understanding of both contemporary and ancient climate. The research of Stallard, Dietrich, and others on the interaction of geomorphology and physical/chemical weathering is sure to be extended in several promising directions that are relevant to the long-term carbon cycle. The role of frost wedging as an agent ofphysical weathering needs to be better understood as a function of global mean surface temperature and topography. The extent of regolith generated on an abiotic Earth and its concomitant increase of potentially reactive mineral surface area needs a closer look by geomorphol-ogists.

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