Why do so many of earth's volcanoes occur along plate boundaries

The plates slide along and against each other which causes earthquakes and is why california is about to fall off the US. Tectonic plates also push against each other to create mountains and volcanoes, the lava is more accessible in that case and it has an outlet to erupt.

Answer the above statement is correct (true);

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city.