Ascientist who investigates how soil properties change with depth is most likely

It would most likely be a geologist.

A geologist studies the properties of the earth.

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. 

Drought resistance because they are close to a lot of supplys