1. What do you think was the effect of great amount of carbon dioxide in the atmosphere before? 2. What was the Source of carbon dioxide and nitrogen then? 3. Did living things already exist during the early times? Why do you say so? do 4. What gases are present in big amounts in the present atmosphere? was the effect of carbon dioxide in the 5. What times? early 6. How did the atmosphere change through time?
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1)Extra carbon dioxide in the atmosphere increases the greenhouse effect. More thermal energy is trapped by the atmosphere, causing the planet to become warmer than it would be naturally. This increase in the Earth's temperature is called global warming .2)Humans have changed the natural carbon cycle by burning fossil fuels, which releases carbon dioxide into the atmosphere. Fossil fuels burning and deforestation are carbon sources.3)Some scientists estimate that 'life' began on our planet as early as four billion years ago. And the first living things were simple, single-celled, micro-organisms called prokaryotes (they lacked a cell membrane and a cell nucleus).4)The dry composition of the atmosphere is mostly nitrogen and oxygen. It also contains fractional amounts of argon and carbon dioxide and trace amounts of other gases, such as helium, neon, methane, krypton, and hydrogen (NASA).5 And 6) When earth was first formed, its atmosphere was likely composed of hydrogen, helium, and other gases that contained hydrogen. ... Over a vast amount of time, millions of years, the earth gradually cooled. When the temperature dropped enough, water vapor condensed and went from a gas to liquid form. This created clouds.