What came first the star or the nebula? Although many questions of the parenthood of our major planet are not completely understood, we have begun to understand the birth of our worlds existence in more detail. The planets ancestor starts in the Precambrian eon. Earth was formed from an accretion saucer (as exclusively planets are) as a result of the suns creation. Dust and gases began as the bases for the blood line of our planet. Other minerals were gather from our accretion disk slowly fashioning the earth larger. As the dust in the accretion disk continued snowballing effect allowed it to gain size and earth to amaze this process is believed to have begun approximately 4.6 gazillion years once again what is called as the solar Nebula Hypothesis.
The first eon within the Precambrian eon was the Hadean eon. Earth within the Hadean eon was volcanic chaos. Iron came to earth in the form of meteorites. Other minerals were gathered from our accretion disk slowly making the earth larger. The new planet at this point
existed without an atmosphere, but things would change allowing manner to evolve.
The Achaean eon began 3.8 billion years ago finish 2.5 billon years ago. inwardly the Achaean eon the earth cooled dramatically. This gave a primitive atmosphere to our planet and only contained toxic gases. Although tangled toxic gases mainly filled this new atmosphere extremophiles came to be the first primordial vivification forms, and began evolving into more complex organisms as atomic number 8 was produced from cynobacteria. As a product of photosynthesis the production of type O propelled the earth into a new stage of its life.
The Protorozoic eon came 2.5 billion years ago ending 543 million years ago. Within this time stable land masses and livable oxygen levels were established. As the planet became more secure new life forms began to evolve. Eukaryotes began...If you want to get a full essay, order it on our website: Orderessay
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