NEET BIOLOGY

Detailed explanation-1: -Mexico City has a high elevation. There is less oxygen so fuels don’t fully burn. This makes a higher level of gas, which can harm eyes, lungs, & the heart. The Sierra Madre mountains surround city & trap in polluted air.

Detailed explanation-2: -The Sierra Madre Occidental is a high plateau of volcanic rock that is eroded in areas to reveal a basement composed of plutonic and sedimentary rocks underlying the two groups of extrusive volcanics.

Detailed explanation-3: -Popocatépetl is 70 km (43 mi) southeast of Mexico City, from where it can be seen regularly, depending on atmospheric conditions. Until recently, the volcano was one of three tall peaks in Mexico to contain glaciers, the others being Iztaccihuatl and Pico de Orizaba.

Detailed explanation-4: -The mountain range runs adjacent to several large cities, including Monterrey (capital of Nueva León state) and Saltillo (capital of Coahuila state). The Sierra Madre Oriental is one of three main mountain ranges surrounding the Mexican Plateau, which covers much of northern and central Mexico.

Detailed explanation-5: -The Sierra Madre Occidental runs along the west of the country. It begins in Sonora and ends in the Sierra Madre del Sur in Oaxaca, making it one of Mexico’s largest mountain ranges. East of this range is the Sierra Madre Oriental, with a length of 840 miles.