1. Folding: This is the most common way mountains are formed. It occurs when tectonic plates collide. The pressure from the collision causes the Earth's crust to buckle and fold like a rug. The highest mountains, like the Himalayas, are formed this way.

2. Volcanism: Volcanoes can create mountains. When magma erupts from the Earth's mantle, it builds up layers of cooled lava and ash. Over time, these layers can form a mountain, like Mount Fuji in Japan.