Precambrian Time by Reagan Ambrose

Precambrian Time by Reagan Ambrose https://padlet.com/reagan74701/gv9rbyj3ts5a Reagan Ambrose Block 4 en-us 2018-04-19 16:31:15 UTC 2025-12-11 22:32:32 UTC hello@padlet.com When Did This Take Place? reagan74701 https://padlet.com/reagan74701/gv9rbyj3ts5a/wish/253521044 This time started 4,600 years before our present day. It ended around 540 million years ago. Covering around 90% of time, there was no period or eon before the Precambrian Time. After this time was the Cambrian Period and the Paleozoic Era.
During this time is when Earth formed. When the oceans appeared, and land began to become prevalent. This time is also when cellular life started to appear. ]]> 2018-04-19 16:36:53 UTC https://padlet.com/reagan74701/gv9rbyj3ts5a/wish/253521044 Why it is Special reagan74701 https://padlet.com/reagan74701/gv9rbyj3ts5a/wish/253525603 This time stretched from the beginning up until 600 million years ago. Which is 90% of Earth's age. It was thought before that no life was in this time, but single celled organisms and a few multi-celled ones emerged. As opposed to the Mesozoic Era, there were no mass extinctions in this era, as there were no major life forms.
During this time period oxygen became prominent in our atmosphere after the nitrogen and carbon dioxide changed. The land was at first non-existent. Eventually small island chains formed, and from that rose the continents. As there was not much land, they didn't really have climates at the time. Even if they did, not enough is know to give a definite answer.]]> 2018-04-19 16:44:36 UTC https://padlet.com/reagan74701/gv9rbyj3ts5a/wish/253525603 Animals and Plants reagan74701 https://padlet.com/reagan74701/gv9rbyj3ts5a/wish/253537528 In the Precambrian Time, Earth went from a burning lava ball, to a water covered planet, and finally to the continents and oceans we know. Although places differently.
This was the time that bacteria and the first Eukaryotes appeared. All of which were single celled organisms. Near the end of the time though a few multi-celled organisms appeared. They had no real defense, but no major predators either.]]> 2018-04-19 17:07:22 UTC https://padlet.com/reagan74701/gv9rbyj3ts5a/wish/253537528 How Was Earth Different? reagan74701 https://padlet.com/reagan74701/gv9rbyj3ts5a/wish/254195221 Since this time stretched for so long, many things changed and remade themselves over the course of many years. For example, there was a lot less land than there is now. Smaller than Canada, most of the land that existed towards the end of Precambrian Time was glacier covered and cold.
At the beginning, there was only a burning ball of magma. Eventually it cooled and formed small island chains in a vast ocean. In time, they would grow to be the continents we know now. Over the Precambrian Time the atmosphere changed too. Going from boiling sulfurous air mainly composed of carbon dioxide, to a nitrogen rich atmosphere with massive oceans. Finally settling on the air composition we have now (Nitrogen and Oxygen mainly).
Not much is known about what the climate and temperatures were back in this time. When everything was magma, estimates are bound to be around lava temperature. Once land had formed, the Earth had a brief ice age, which happened late in Precambrian Time. The temperatures and climate is estimated to have varied so much within this time, none of it is certain either. Below is what the Earth is thought to have looked like in the Archean Era. When the world was mostly water with island chains as the only land masses. ]]> 2018-04-22 22:46:08 UTC https://padlet.com/reagan74701/gv9rbyj3ts5a/wish/254195221 Sources reagan74701 https://padlet.com/reagan74701/gv9rbyj3ts5a/wish/254201561 1. http://geo.msu.edu/extra/geogmich/precambrian.html

2. https://www.livescience.com/43354-precambrian-time.html

3.http://www.elic.ucl.ac.be/textbook/images/image5x06.jpg
4.https://biochemanics.files.wordpress.com/2013/03/125817436.png

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