One of the four major divisions of our Earth system, the one that ...

[Arii_bell]

One of the four major divisions of our Earth system, the one that can be described as a blanket of air that envelops Earth, is the ___________________ _.
 Fill in the blank(s) with correct word

Question 2

Alfred Wegener is well known for hypothesizing that ____.
 a. mountain ranges only exist where erosion is very weak
 b. new oceanic crust is formed at subduction zones
 c. the magnetic poles have reversed on occasion during geologic time
 d. over time, the continents change their geographic position
 e. the inner core is molten

[Heffejeff]

Answer to Question 1

atmosphere

Answer to Question 2

d

[Arii_bell]

Thanks for the timely response, appreciate it

[momolu]

Excellent