Final answer:
The Rocky Mountains form the border between Alberta and British Columbia, formed mainly during the Laramide Orogeny and shaped by glaciation and erosion.
Step-by-step explanation:
The mountain range that forms a border between Alberta and British Columbia is the Rocky Mountains. The Rockies are a significant mountain system in North America that extends from the northernmost part of British Columbia, in Canada, to New Mexico, in the United States.
The Laramide Orogeny played a crucial role in their formation, which is different from other mountain-building processes like those that formed the Himalayas. The Rockies went through a period of uplift followed by glaciation and erosion, which shaped their current form.