How did Mexico City start sinking?

Mexico City is sinking due to several factors, including:

- Groundwater Extraction: Mexico City is built on a former lake bed and the soil beneath the city is composed of soft clay and sand. When groundwater is pumped out for human use, it causes the soil to compact and sink, leading to subsidence.

- Weight of Buildings: The increasing number of tall buildings and infrastructure projects in Mexico City adds weight to the ground, further contributing to subsidence.

- Earthquake Activity: Mexico City is located in a seismically active region and earthquakes can also cause the ground to sink.

The sinking of Mexico City has caused several problems, including damage to buildings and infrastructure, flooding, and disruption of water and sewage systems. The city has implemented several measures to address the problem, such as regulating groundwater extraction, building earthquake-resistant structures, and implementing a system of deep wells to drain groundwater.