Most of the highways of South America are concentrated on the ...

[clippers!]

Most of the highways of South America are concentrated on the ________ and connect ________.
 
  A) coast; large cities
  B) mountains; mineral deposits
  C) rivers; ports with indigenous tribal areas
  D) plateaus; clusters of small towns

Question 2

Describe and discuss the environmental problems of Mexico City.
 
  What will be an ideal response?

[josephsuarez]

Answer to Question 1

A

Answer to Question 2

Problems in the Valley of Mexico include smog and depletion of the aquifer that underlies Mexico City. The smog from automobiles and industry is exacerbated by thermal inversions trapping the pollution into the high elevation valley. The depletion of the aquifer has also contributed to subsidence. High population in the city and squatter settlements are also adding to the problems.

[clippers!]

Thanks for the timely response, appreciate it

[bitingbit]

YES! Correct, THANKS for helping me on my review