What makes the Earth unique?
Unlike the other planets of our solar system, life developed into many forms on the Earth after its emergence. Liquid water and oxygen for breathing made this possible. Millions of species of plants and animals thrive today on land and in water, Water covers more than two-thirds of the Earth’s surface. Therefore, the Earth appears blue from the moon or from the International Space Station. For this reason, it is also called the blue planet’ Till now, scientists have not discovered life in any other place in the universe, but they believe that one day they will do so.
How was the Earth Formed
The Earth, along with the sun and the remaining planets of our solar system originated around 4.8
billion years ago from dust particles, which agglomerated gradually . At that time the young Earth was Bombarded by countless meteorites from Space. The Earth’s interior was molten and volcanoes erupt constantly But over millions of year the Earth’s surface cooled down Around 3.8 billion years ago the temperature decreased to about 100*c and the Earth’s crust slowly started becoming solid. At this time the gaseous cover on the Earth was mostly made up of water vapour.
The Earth, along with the sun and the remaining planets of our solar system originated around 4.8
billion years ago from dust particles, which agglomerated gradually . At that time the young Earth was Bombarded by countless meteorites from Space. The Earth’s interior was molten and volcanoes erupt constantly But over millions of year the Earth’s surface cooled down Around 3.8 billion years ago the temperature decreased to about 100*c and the Earth’s crust slowly started becoming solid. At this time the gaseous cover on the Earth was mostly made up of water vapour.
Where does the oxygen we breathe come from?
Gaseous oxygen was created on the Earth about 3.5 billion years ago. At that time,the UV light of the sun decomposed the water vapour molecules present the atmosphere, and released oxygen and hydrogen. But a major part of the oxygen immediately reacted with other substances, so that it was no longer available in the atmosphere as gas. oxygen was also produced by the seas, Blue-green al where the blue algae’ carried out photosynthesis page 59). These bacteria converted sunlight and carbon dioxide into energy. In the process, gaseous oxygen was released as a “waste product’ which accumulated in the atmosphere. About one billion years ago, about one-twentieth (4%) of the atmosphere consisted of oxygen.
Is there life on any planet other than the Earth?
There is no life on the other planets in our a solar system because their environments are not favorable for life. They are either too hot, too cold, or too stormy. The only place that can be assumed capable of sustaining life is Europa, the that moon Jupiter. Scientists be an ocean of liquid water could under present on this celestial body under a 10-km thick layer of ice. They could say that civilizations like ours be present at all-only outside of our system.
Why did life develop on the Earth?
The origin of life on the Earth is a fortunate series of events The Earth’s distance from the sun was such that its atmosphere and surface cooled down to a moderate level. Liquid water and not just water vapour also formed, and it did not freeze as the sun was not too far away. The cooling of the Earth gave rise to a kind of primordial ocean’. The action of the UV rays of the sun, the lightning flashes produced by storms,and the countless volcanic eruptions gave rise to new complex chemical compounds About 4 billion years ago, the first molecules appeared, from which the first unicellular organisms were formed.
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