Try Landslide Lab free in your browser, with nothing to install and no account. Make a hillside slide, and find out why. Rain on a forested hill above a road and watch the water rise inside the soil; clear the trees or cut the road into the bottom of the slope, and the hill lets go, runs down the hollow and spreads across the valley. In winter, build a season of snowfalls, cold nights and wind, dig a snow pit to see its layers, and watch a slab avalanche break loose on a weak layer. Then forecast a mountain you have not seen and protect the houses below.