Tectonic plates are present on the earth's surface because
the lithosphere is weak and cracked in several places
the core is so hot that it created cracks in the crust
the hot asthenosphere created cracks in the lithosphere
the earth was originally formed with cracks in its lithosphere

Theyre on the surface because theyre less dense.

Answer were lower;

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.