Can sombody please help me with the rest .

I think the first empty box is non metal. The next box I think is metal? Last box I think is thick or increasing.

Explanation:

i think it would be   c)   the raw   materials necesarry to produce   goods

i think im right about 70%

  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.