Final answer:
The hills surrounding the epicenter of the 2005 earthquake in the western Himalayas were impacted by landslides, floods, and volcanic activity.
Step-by-step explanation:
The hills surrounding the epicenter of the 2005 earthquake that hit the western Himalayas were impacted by the earthquake. The earthquake triggered landslides, massive floods of mud and rock, and flows of hot volcanic rock. These events transformed the landscape and caused devastation in the affected areas.