alpine altitude America baker fireweed flora flower glacier high lupine montane mountain natural nature usa wild alp alps Chamonix cloud danger downhill mont blanc Monte Bianco peak skiing summit winter austere bank bleak canada cliff dour foot harsh ice range rock Rockies Rocky Mountains silt snow stern Aiguille du midi climbing mountaineering erosion glaciere melting mount national park rainer river rocks Roots sundland trees us Washington water american height landscape Mount Baker terrain top view