In terms of symbolizing a geologic unit/formation, which is not true? a) The first capitalized letter stands for the system/epoch of the formation. b) The second portion of the symbol is lowercase, and represents the formation or unit. c) The formation name is symbolized by capital letters. d) Colors are often used to differentiate different geographic regions.

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. 

Ctrust me i know its c