The eastern foothills of the Andes are important areas for Argentina’s agriculture, as rivers from the mountains are impounded …to supply electricity and irrigation for crops. Many types of volcanic surfaces in this region shine in spite of their aridity. The peaks of the title are at low center, and have a unique gully pattern within the ash beds on their flanks. At print scale the marks of many roads and airstrips, of canals and gas fields and even power lines, are evidence of the advanced state of development in this part of South America.

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