A new study claims that the planet Earth turned into a completely bluish planet 200 million years after its creation. Scientists say Blue Planet. Judith Coggon , a researcher at the German Forest University , said the environment was horrible when the earth was first formed. That is why the first 600 years of this planet called Earth are called ' Hadean' . The word most probably comes from ' Hades' , which means 'house of yam'! Earlier it was thought that the earth was extremely hot and uninhabitable during this period. For these 800 years, our world has been moving towards its permanent formation. Judith and her team find a rock in Greenland that is 4.1 billion years old. This means that the rock was formed only 400 million years after the creation of the earth. According to them , metals like gold and platinum which were able to mix with molten iron , therefore they are found in nature with various ores rich in iron. The abundance of these metals on the Earth's surface suggests that they are so abundant on Earth because of the meteors and comets that hit the Earth's surface 3.9 billion years ago. According to scientists, meteors and comets are also the cause of this abundance of water in the Earth's chest. They used to carry water particles with them along with other metals in the form of ice. The ancient stone found by Judith gives us the idea that the earth 's crust contains a large amount of metals that can be easily mixed with iron and iron. And the rock also indicates that the mantle was formed 4.1 billion years ago. Due to the presence of iron and various minerals rich in iron, the Earth looks like a 'blue planet' from the outside.