How can studying glaciers and other iceforms help climatologist, climate scientist, understand the changes in the earth's climate over time?

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. 

D. coal i hope that

The answer to your question is d. convection currents. hope this you.