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The Himalaya grow as India and Eurasia collide. Analyses of deformation during the 2015 Gorkha earthquake suggest that slip on small-scale splay faults, as well as motion during the interseismic period, help to create Earth's highest mountains.
Rockfall often seems to occur spontaneously without an obvious cause. Monitoring of a granitic cliff reveals that cyclical temperature variations can subtly act to slowly and incrementally damage hard rock until failure is inevitable.