Andes is younger and does not freeze the base district to the West of the continent. Lands to the East of the Andes is the Amazon River basin, most of which is rain forest zone.
Andes and the youngest non-stop across the western side of the continent. The land east of the Andes Amazon River basin is. The majority of the rain forest.
Andes with young and restless across the region on the western side of the continent. The land east of the Andes is the Amazon River Basin, which is mainly raw forest relief.