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Mexican Volcanic Landscape

Ringed by mountains, this basin, averaging over 2400 meters in elevation, is an example of an interior drainage system created by a volcanic landscape. Swamps or marshes (1) develop in the low area, and water levels fluctuate greatly with the seasons. The better drained land is cultivated (2). Eroded volcanoes mark the landscape (3). The snow-capped stratovolcano , Pico de Orizaba (4), last erupted in 1687. Note the difference in vegetative cover between the mountain slopes and the basin floor. (61A-34-012, 013)

Mexican Volcanic Zone
The absence of a well-defined external drainage system is illustrated in the low oblique photograph of the eastern Mexican Volcanic Zone to the right.

1) Nevado de Toluca
2) Toluca
3) Mexico City
4) Volcán Popocatepetl
5) Pueblo
6) Cerro La Malinche
7) Basin of interior drainage
8) Pico de Orizaba
9) Gulf of Mexico

(61C-32-002)

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