The andes are the result of plate tectonics processes caused by the subduction of oceanic crust beneath the south american continental plate. Facts about andes mountains 2. http://justfunfacts.com/wp-content/uploads/2016/09/mountain-aconcagua.jpg Interesting Facts About The Andes Just Fun Facts The only mountains that are taller than the andes are the himalaya mountains and their adjacent ranges including the hindu kush.