Simplify the following text for a Grade 9 native English-speaking person.
Original: Many of the mountain ranges feature extensive glaciers , such as at the Adula , the Albula , the Silvretta , the Bernina , the Bregaglia and the RÃ tikon ranges .
Simplified: Many of the mountain ranges feature huge glaciers , such as at the Adula , the Albula , the Silvretta , the Bernina , the Bregaglia and the RÃ tikon ranges .