BIO 200 Lecture Notes - Lecture 2: Cenozoic, Multicellular Organism, Paleozoic
9 Jun 2015
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Document Summary
We don"t think of the earth as entity. Meanwhile, gravity causes matter to condense around those protoplanets that are outside the new of the sun gravitational grasp. As this is happening, the rest of the disk begins separating to rings that become orbits of our planet. Larger fragments collide together and become larger and larger objects that become plants later. These protoplanet 150 kilometers away from the sun, it was the protoplanet earth: 4. 7 billion years the earth was formed, after the solar system, history of earth (it"s divided to 3 periods unequal) aka how we divide time: It"s divided to 3 eon"s, the first is the hadean (hell) eon it"s unified not so many changes, no ocean, no o2 , no protective atmosphere. Molten, filled with material leftover from forming the solar system. In the end of the hadean era the earth surface cooled quick, formed solid cross.
