What makes the Earth unique?|How was the earth formed?|Why did life develop on the earth?

What makes the Earth unique?|How was the earth formed?|Why did life develop on the earth?

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 breating made this possible.

Millions of species of plants and animal thrive today on land and in water. Water covered more than two-third of earth surface. Therefore, the Earth appears blue from the moon or from the International space station.our planet is called blue planet. Till now, scientists have not discovered life in any other place in universe, but they belive that one day they will do so.

How was the Earth formed?

The Earth,along with sun and the remaining planet of our solar system, originated around 4.8 billion years ago from dust partical, which agglomerated gradually.

At that time, the young earth was bombarded by countless meteorites from space. The earth's interior was molten and volcanoes erupted constantly. But over millions of year, the earth's surface cooled down. Around 3.8 billion years ago, the temperature decreased to about 100 degrees and the Earth's crust slowly started become solid. At this time the gaseous cover on the earth was mostly made up of water vapours.

Why did life develop on the earth?

The origin of life on earth is a fortunate series of events. The Earth's distance from the sun was such that it 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 uv rays of the sun, the lightning flashes produce by storms, and the countless volcanic eruptions gave rise to new complex chemical compounds. About 4 billions years ago, the first molecules appeared, from which the first unicellular organisms were formed.