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Aerial view of erosions in Buriticupu, Maranhao state, Brazil, taken on April 21, 2023. The city of 70,000 is suffering from the advance of "vocorocas" - "torn earth" in the indigenous Tupi-Guarani language - erosions that begin as small cracks in the ground and grow into large craters that, seen from the air, look like advancing canyons swallowing up chunks of the town.