science project 2

science project 2

Published on 12 September 2020
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Transcript
00:05
We know that life on earth began at least 3.5 billion years ago, because that is the age of the oldest rock with fossil evidence of life. At that time, atmosphere contained oxygen in much larger proportion than all other basic gases in air, unlike today. And it’s a fact that at that time the size of organisms were much bigger than that of today’s date. The atmosphere was totally free from any kind of pollution. Later when human came and evolved, they started reasoning and dealing with different things around them, and after a very long period of time, they invented various things again which makes our day to day life more flexible, saves their time, and also from this stage the slowly and steadily depletion of our own planet starts. Initially they didn’t recognized or noticed that, but later the depletion poked their mind in a time where already destruction has moved to a certain level where balancing it was a tough work. And the biggest example is, the depletion of Ozone Layer