A layer of gases that surrounds Earth and contains the air we breathe.

Concept: An atmosphere is the layers of gasses encompassing a planet or other ethereal body. Earth’s air is composed of around 78% nitrogen, 21% oxygen, and one percent other gasses. Earth's climate is so much more than the air we breathe. 

A trip from the surface of Soil to external space would result in passing through five diverse layers, each with exceptionally diverse characteristics.

Hence,the correct answer is option 1.