sentences:  These cinders are easily washed away by rain and surface water flow, so that the Puntiagudo, an elder brother of the Osorno, is denuded to the hard core of lava frozen inside the volcanic chimney.In a recent geological if not historical event, rocks of volcanic origin raised the Ensenada depression between the Osorno and the Calbuco volcanoes, thus forcing the Llanquihue lake to open a new outlet to the sea on its western shore.The vegetation of the Park corresponds to the Valdivian temperate rain forests in its mountain variant.