How is the Amazon basin formed?
Answers
Answer:
At one time Amazon River flowed westward, perhaps as part of a proto-Congo (Zaire) river system from the interior of present day Africa when the continents were joined as part of Gondwana. Fifteen million years ago, the Andes were formed by the collision of the South American plate with the Nazca plate. The rise of the Andes and the linkage of the Brazilian and Guyana bedrock shields, blocked the river and caused the Amazon to become a vast inland sea. Gradually this inland sea became a massive swampy, freshwater lake and the marine inhabitants adapted to life in freshwater.
Answer:
As South America shifted westward it collided with the Nazca plate which was moving east. The collision pushed up the softer sedimentary rock along the western boundry to form fold mountains-the Andes. At the same time land in the north and east buckled, forming a basin.
Explanation:
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