A geological time period during which mountain ranges are formed.

वह भूवैज्ञानिक समय अवधि जब पर्वत श्रृंखलाएँ बनती हैं।

English Usage: The Himalayas were formed during a significant mountain building period.

Hindi Usage: हिमालय पर्वत एक महत्वपूर्ण पर्वत निर्माण अवधि के दौरान बने।