Mountain ranges are formed as a result of the collision of tectonic plates.
Young orogenic mountain ranges have formed tens of millions of years ago. They are characterized by tall mountains, sharp peaks and steep slopes.
Old orogenic mountain ranges have formed hundreds of millions of years ago. Exogenic processes have worn down these mountain ranges, making their peaks flat and their slopes gentle.
Many mountain ranges contain volcanoes.
Key words: mountain range, young orogenic mountain range, old orogenic mountain range.
Mountain ranges: The Rocky Mountains and the Andes (the Americas), the Himalayan Mountains (Asia), the Alps (Europe).