Origin of Earth

Earth and the other celestial bodies in the solar system has always been a subject of fascination for all of us. People, since the early times were eager to know about the origin of Earth and the evolution of life on it.

Different scientific methods to know the age of the earth have been employed. These methods are:

    Tidal Force

    Radioactivity

    Salinity of the Ocean

    Rate of Erosion

    Sedimentation

Tidal Force theory estimates the age of the earth with regard to the moon’s age.

Rate of Erosion is another method of calculating the age of the earth. It is based on the erosional rate of the earth’s surface.

Process of sedimentation continued ever since the earth cooled from liquid to solid state and is still continuing.

Thickness of sedimentation and the annual rate of thickening of first sedimentary rock may help to estimate the earth’s age.

Salinity of the ocean is also used to determine the age of the earth.

If the total amount and annual rate of oceanic salt is determined, the age of the ocean may be calculated.

Radioactivity is another method to determine the age of the earth.

The formation of earth has also been explained by different theories.

There are various theories and hypotheses that tried to explain the origin of the universe. These are:

    Gaseous Mass Hypothesis of Kant

    Nebular Hypothesis of Laplace

    Tidal Hypothesis of Jeans and Jaffrey

    Electromagnetic Theory of Dr. Hannes Alfven

    Inter-Stellar Dust Hypothesis of Otto Schmidt

    Planetesimal Hypothesis of Chamberlin and Moulton

    Big Bang Theory

    Hoyle’s concept of steady state

The Big Bang theory is a modern theory, explaining the origin of the solar system. It is also called the Expanding Universe Hypothesis.

It is believed that, all the planet of our solar system is formed by the same process. Hence, all the theories and hypothesis advocated for the origin of the solar system is valid for the origin of the earth.

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