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Universe- The infinite Frontier 20: Planet Earth (A HOT BEGINNING…
Universe- The infinite Frontier 20: Planet Earth
A HOT BEGINNING
Astronomers believed our began in a swirling tempest of gas and dust
We think that all planets including earth formed by the collision of smaller bodies
The physics, the chemistry all operate the same on all the different planets and there are more examples of other planets
It was above the melting point and therefore was a fluid and the inside the earth crystallized slowly out of the mag motion as it cooled and groom
To understand those other worlds we must first examine the forces that formed and continue to shape planet earth
The present earth is the remnant of what was intially a very hot beginning
In the early period of history of earth which lasted only 100 million years a tremendous amount of energy was released
The conditions were very traumatic violent even because of these continuing impacts in this early stage we might think of this earth almost completely molten
LIFE ON EARTH
These volcanic emanations were magma comes out of the earth produce very interesting surface features such as the great mountain chains that we see in conical mountains
In some planets mostly the so called terrestrial planets it's very important on earth as we know because of it's big thermal engine but may also be important on planets such as Venus or Mars
The massive heat engine buckles continents pushes up mountain range and builds internal pressure that can erupted in a fury of heat and molten
In fact there is no evidence that the first one billion years of the earth's existence because all of these rocks have disappeared and presumably been resolved in a molten magma
WATER ON THE PLANET EARTH
In time the earth cooled and most likely it's atmosphere condensed in a great rain storms that form the first oceans
From the interactions of the ancient atmosphere and ocean there would arise a new force to help shape the planet
We believe that the early stages of earth history when the water was covering the earth, the oceans would have been much more acidic, the atmosphere would have been made up of compounds like CO2, hydrogen, chloride, those are very acidic conditions
Oceans acted as a medium by which carbon dioxide could be covered into carbonates and carbonate rock formation mainly lime stones which then sequestered most of the carbon dioxide originally emitted into the earth's atmosphere
Carbon dioxide dissolves in rain water and in oceans forms carbonate rocks which settled sediment into limestone deposits
The important role is the ocean maintaining the earth's environment as we know it today