<span>parts of Europe are very polluted because they have a very high population density</span>
The distribution of earthquakes outlines the boundaries of the earth's tectonic plates. The crust is broken up into slabs of rock called tectonic plates. There are seven major plates and many smaller ones. The boundaries of these plates, where they interact with each other is marked by earthquake activity. The plates diverge, converge or slide past each other at slow rates. The movement of the plates generates earthquakes.
Teotihuacan is an ancient American city and currently an archeological site in Mexico, close to Mexico City.
The city was ancient even to the Aztecs who, like us, only saw the ruins of the city (the name was given by the Aztecs and we don't know what the original inhabitants of the site called it).
