The earth is 4.5 billion years old. The Big Bang theory says that there was an explosion caused by the crash of matter which created our Solar System. Millions of years ago, during the Paleozoic era, the seven continents formed one single super-continent, from which they later detached driven by endogenous forces. Mankind appeared on Earth 30000 years ago. According to Darwin organisms which adapt the best to the environment they live in, survive the longest. Mankind become the dominant species because mankind is the most intelligent species and has got the specific skill of adaptation and the desire to understand and study natural phenomena. But man's influence has also had an impact on the habitats and the living conditions of many plants and animals. This happens because, as technology and industries become more advanced, more and more of the natural resources available are being used. There are perpetual, renewable and non-renewable resources. Perpetual resources are unlimited instead renewable and non-renewable resources have a limit but renewable resources can be replaced. Deforestation is especially present in the tropical areas because of the poor economic conditions of the countries where big rainforests are located. The deforestation will affect the change of the global climate, the agriculture and water supply. Water scarcity will cause food scarcity, and all this will lead to high food prices, thus causing economic and political instability, especially in the developing countries. In order to have a sustainable development, we will have to replace our fossil-fuel-based system with a global renewable-energy-based economy.
The Earth is the third planet in the solar system. The Earth is surrounded by the atmosphere, a mixture of gases which blocks out dangerous rays from the sun. Our atmosphere is composed of 78% nitrogen, 21% oxygen and 1% other gases and it is divided into five layers. The atmosphere also protects the Earth from meteors,...
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