Why does earth not continually get larger and larger

Because the earth is made of rock. therefore, rock doesn’t grow. However, tectonic plates within the earths crust shift that cause earthquakes and tsunamis.

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. 

Its led to migrationits led to death