 Complete the following phrase:  The ecological consequences of the draining were enormous. Parts of the valleys were turned semi-arid, and even today Mexico City suffers from lack of water. Due to overdrafting that is depleting the aquifer beneath the city, Mexico City is estimated to have sunk 10 meters 33 feet in the last century. Furthermore, because soft lake sediments underlie most of Mexico City, the city has proven vulnerable to soil liquefaction during earthquakes, most notably 