You can very easily trigger avalanches on many steep slopes. Avalanches can get large enough to bury a car or destroy a small house (size 3).
You can trigger avalanches on a few steep slopes. Avalanches can get large enough to bury a large truck or destroy several houses (size 4).
You can trigger avalanches on a few steep slopes. Avalanches can get large enough to bury a large truck or destroy several houses (size 4).