What formation is the Andes? It is the result of a convergent plate boundary between the Nazca Plate and the South American Plate. The main cause of the rise of the Andes is the compression of the western rim of the South American Plate due to the subduction of the Nazca Plate and the Antarctic Plate.
How did the Andes Mountains form in South America?
The mountains have been formed as a result of the convergence of the Nazca plate and the South American plate. The heavier oceanic crust of the Nazca plate is pushed towards the South American plate, and because it is denser is subducted underneath.
How was the Andes formed ks2?
The Andes are a result of plate tectonics processes, caused by the subduction of oceanic crust beneath the South American continental plate. This means that two tectonic plates pushed together and one had to lie above the other, disrupting the Earth’s surface. the Andes began to take their present form.
When did the Andes mountains begin to form?
An international team of geologists were intrigued by the Andes’ geology and have finally solved a mystery that scientists had previously been unable to answer: the mountains were formed only 45 million years ago yet the massive forces that pushed them up have been at work for 140 million years as the Nazca tectonic
How did the Andes mountains change over time?
It’s been understood that the Andes mountain range has been growing as the Nazca oceanic plate slips underneath the South American continental plate, causing the Earth’s crust to shorten (by folding and faulting) and thicken.
What leads to volcanism in the Andes?
The volcanic arc has formed due to subduction of the Nazca Plate under western South America along the Peru–Chile Trench.
When subduction occurs what is formed?
The area where subduction occurs is known as the subduction zone. When one plate begins to slip underneath another one a trench is formed. The earthquakes that result due to the plates grinding against each other often cause magma to spill out through the trench in submarine volcanoes.
Where was the Andes mountains formed?
It is the result of a convergent plate boundary between the Nazca Plate and the South American Plate. The main cause of the rise of the Andes is the compression of the western rim of the South American Plate due to the subduction of the Nazca Plate and the Antarctic Plate.
What type of fault are the Andes mountains?
It is a major fault with crustal significance. The Andes Mountain belt trends with respect to the Nazca Plate/South American Plate convergence zone, and deformation is divided between the Precordilleran thrust faults and the El Tigre strike-slip motion. The El Tigre Fault is currently seismically active.
How have humans changed the Andes mountains?
Population pressure and migration are deforestation drivers caused by the increasing need for new and greater areas for agricultural production and an increasing demand for food, water and energy by large populations in distant urban centers as well as in Amazonian communities.
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