#13 If We Lose Out On Oxygen.
Tanning is more quick and excessive as well.

#12 The Darker Days.
As the oxygen particles reflects sunlight making days brighter.
Continue ahead to know more effects of decreased oxygen.

#11 Effects On Metals.
As it's oxidation that helps in welding.

#10 Crumbles Crust.
The crust would deform die to loss of oxygen.
Head on to the next page, there's more to it.

#9 How Would You Look!
As our atmosphere is almost 21% of oxygen.

#8 Everything Will Turn To Dust..
For oxygen forms the most essential thing during concrete making.
Also, what will happen if there's excess of it, read on the upcoming pages.

#7 You Will Lose Your Existence..
With lose of oxygen you might just explode.

#6 Oceans Into The Space.
As water is made up of 1/3 oxygen and without which hydrogen will just float over.

#5 The Other Way Round..
If earth ever got it's oxygen's amount doubled, this is what will happen.

#4 Happier As Never.
More the oxygen, more happier the Earth would be.

#3 And Healthier As Well.
It'd improve our health inside out.

#2 It's Not Always Good.
Excess oxygen will lead to bigger insects as they grow depending upon the oxygen surrounding them.

#1 Watch It All.
Here's the video below depicting the ifs and buts of alteration in oxygen level.