The spanish built presidios in order to
a. protect missions from attack.
b. serve as mission churches.
c. provide centers of government.
d. act as trading centers.

Probably north korea if your family has decided to use only nuclear power.

Answerjoe ran 130 yards;

Answer volcanic outgassing;

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.