The Nazca plate, named after the Nazca region of southern Peru, is an oceanic tectonic plate in the eastern Pacific Ocean basin off the west coast of South American. The ongoing subduction, along the Peru- Chile trench, of the Nazca Plate under the South American Playe is largely responsible for the Andean Orogeny
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The pesticide will be in the animals that eat the grasshoppers, in the water table, in humans that eat the animals/crops and drink the water.
The goverment or landonwers