The radioisotopes are used to analysis the estimation of age the of the planet earth. It is thought to be 4.5 billion years old. The water is formed on Earth by making collision with asteroids and numerous icy comets. The interior Earth has volcano, which is responsible for the formation of water vapor. The water vapor formed due to extensive heat of the volcanic out gas.
Explanation of Solution
In south western green land many oldest sedimentary rocks have been discovered. These rocks were formed around 3.86 billion years ago. It indicates the earth was cooled by the condensation of water vapors and formation of early oceans. Another hypothesis suggest that the oceans were formed early as 4.3 billion years ago, it indicates by the presence of impurities like isotopic ratio of oxygen in the deposited crystals of zircon mineral.
The microfossils have bacteria found on few early rocks, these are found as cocci and rods. The stromatolites are considered as the microbial fossils present in the rocks which is formed over 3.5 billion years ago. Microbial mats and minerals are fossilized in the stromatolites.
The ancient stromatolites have Chloroflexus, a filamentous phototropic bacteria that are considered as ancestors of non-sulfur bacterium. This gives evidence that microorganism evolved one billion years after the formation of the earth with their morphological diversity.
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Brock Biology of Microorganisms (14th Edition)
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