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 plant'. 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 erupted  constantly. But over millions of years, the Earth's surface cooled down. Around 3-8 billion years ago, the temperature decreased to about 100 dC and the Earth's crust slowly becoming solid. At this time the gaseous cover on the Earth was mostly made up of water vapour.

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 firs unicellular organisms were formed.

This image taken from google image for educational purpose.