It didn't.
The river rises in the Andes mountains in Peru, The location is Novado Mismi
There are about 46 that rise 20000 feet
What are two natural occurrences common in the Andes, that cause the mountains to rise and the coast to sink?
The Nazca and the South American plates are colliding forming the Andes Mountain.
Yes many different types of metals were found in the Andes mountains until there was a rise in goat population and all the goats ate the metal. For more on this info go to goatseatmetal.com.
Volcanic eruptions and earthquakes.
The Andes Mountain Range is a result of the Nazca Plate subducting under the South American Plate.
The earth's landforms are always slowly changing which can cause earth's water supply to rise or fall.
Andes.
Andes Range
An effect of the earth movements becoming slow is that the rotation of the earth will increase. The slow movement has also made the mountains rise and creating more earthquakes.
Both the Amazon and the Atacama desert owe their very existence to the Andes Mountains. The general flow of the atmosphere is from east to west in South America. As the Atlantic moisture is forced up the high Andes Mountains it drops most of its rain and snow on the eastern slopes that feed the Amazon River and its tributaries. Since the moisture has difficulty crossing the mountains, the western side lies in a rain shadow and little to no precipitation occurs, forming the Atacama Desert.