What is mountain extinct volcano and the highest point in the western hemisphere?

A mountain extinct volcano is a type of volcano that has not erupted in a significant period of time and is not expected to erupt again, often characterized by eroded features and a lack of volcanic activity. The highest point in the Western Hemisphere is Aconcagua, located in the Andes mountain range in Argentina, which stands at approximately 6,961 meters (22,838 feet) above sea level. Aconcagua is a popular destination for climbers and is known for its challenging ascent.