Anyone climbing a mountain that requlres more technical skills than hiking is mountaineering or alpine climbing. (The sport originated in the French and Swiss Alps.) Technical climbing in the mountains can be on rock, snowy slopes, ice, or glaciers-sometimes all four. Such climbing is more dangerous than rock climbing on valley cliffs because of unpredictable _ such as rock fall, Lightning, storms,altitude sickness and fatigue. A note of terminology: Rock climbing at a cliff or crag is not "mountain climbing.» Many rock climbers never venture into the mountains and wouldn't recognize themselves as mountain climbers.