Genesis 1:8

God called the firmament Heaven. The product of the creative power of God on the second day of the creation week received a name, even as the light of the first day had received one. In the Hebrew as well as in the modern translation the word “heaven” is the name given both to the abode of God and to the firmament. In this verse “heaven” refers to the atmospheric heavens that appear to the human eye as a canopy, or dome, vaulting our earth, and generally called sky.

No life is possible without air. Plants need it as well as living creatures. Without the atmosphere our earth would be lifeless like the moon, tremendously hot in that part which is exposed to the sun and extremely cold in other sections. Not one sprout of plant life would be found anywhere, and no creature could exist for any length of time. Are we grateful for this God-given atmosphere?