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The Space Travelers Web Site! Geology |
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5 Billion (5,000,000,000) years ago the earth formed from space debris.
* Do a web search or click here for more information on
[See Gravity]For now, let's assume all planets, meteors and space stuff, is made of random samples of chemicals that are found here on Earth.
[See Chemistry] There may be exceptions but we have not found them yet. We will keep looking! In the beginning, how long was a day before there was light? Not much to see here, lets move along.3.8 billion years ago (bya) - oldest rocks, Greenland tell us that as the Earth's crust cooled and solidified, we expect the atmosphere was reducing (CH4, CO2, (Atmosphere is 80% N2, a form inaccessible to life except for certain bacteria,) NH3)
Presence of sedimentary rocks implies liquid water present, the primordial soup. Volcanoes spit out sulfur, molten Lava and volcanic ash.
(Reference only) http://www.ucmp.berkeley.edu/people/brs/biol1a/Lect5.html
Lightning storm's and volcanoes raged all over the hot Earth surface. The conditions were hostile to human life but they were right to start the chemical chain of events and it was now only a matter of time.
During a period, around 3,500 million years ago, our world's oldest micro-organisms (Prokaryote) could be found.
Drifting Continents:
225 mya Super continent Pangaea and the Panthalassa ocean
180 mya Northern Lurasia, Southern Gondwanland
Gondwanland breaks into South America, Africa, Australia and Antarctica.
A new ocean floor is formed
135 mya Eurasia rotates, India drifts north. The north Atlantic and Indian Ocean open. The south Atlantic s formed.
65 mya India moves to collide with Europe, Australia is still attached to Antarctica.
today, Australia continues to drift north, America (North and South) continue to drift west.
The Great Geographical Atlas
Pub: Rand McNally,
ISBN 528-83384-7
Pg13
This is just here for a place holder to test other pages.
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