Mexico and Central America is a land bridge between North America and South America. Western Mexico is part of the ring of fire, which is a place of tectonic unrest. There are a number of mountains, including the Sierra Madre Occidental, which is a group of northwestern mountains that is considered an extension of the Rockies. Between the mountains is the Mexican Plateau, which is further broken into the Mesa del Norte and the Mesa Central, which is the northern and central plateau respectively.
Northern Mexico is very dry, and the mountains make vertical climate zones, which don't collect the usual amount of water as a normal tropic area. There are very few rivers in the North, but one very important exceptions is the Rio Grande. There is also a large fishing industry in mexico.
Regional high pressure systems keep north Mexico very dry. Southern Mexico is much more diverse in its biomes. It is very hot in the southern south, and in the East it is very humid, which allows many different biomes to prosper. Minerals are a great source of revenue for Mexico, mostly silver. This earns the Mexican government lots of money. Mexico also is a leading producer in petroleum. Mexico is defined as a chaparral biome.