Final answer:
The Andes Mountains reach their greatest average width and height in Argentina, where Mount Aconcagua, the highest peak in the Western Hemisphere, is located.
Step-by-step explanation:
The Andes Mountains achieve their greatest average width and height in the country of Argentina. The Andes here span the entire western border with Chile, and this region is home to Mount Aconcagua, which stands at 22,841 feet and is the highest peak in the Western Hemisphere. The Andes are known for their extensive length and elevation, with over 30 peaks rising at least 20,000 feet above sea level, and many being active volcanoes.
Argentina's portion of the Andes includes diverse environmental extremes, from towering mountains to the lowest point in the Western Hemisphere at Laguna del Carbon, at -344 feet below sea level. Within this vast range, you can find a variety of climates, from the tropical conditions in the north to the arid Atacama Desert on the western slopes due to the rain shadow effect.
The physical geography of the Andes in Argentina contributes significantly to the country's characteristic as a land of extremes, with a high impact on both its natural features and human activities.