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Comprising of the Paleoproterozoic, Mesoproterozoic and Neoproterozoic Eras, This eon spans from 2.5 billion years ago to 541 million years ago lasting almost 2 billion years.
During the beginning of this eon, cyanobacteria rapidly reproduced and photosynthesized turning a lot of carbon dioxide to oxygen. This oxygen reacted with the iron in the oceans, filling the oceans with iron rust BIFs, turning the oceans blood red. Later, there was no longer enough iron to hold onto the oxygen, and it escaped into the atmosphere. That oxygen formed the ozone layer. Nearly all of the carbon dioxide turned into oxygen, turning earth into a snowball earth.
The snowball earth quickly recovered after 300 million years. Then, supercontinent Columbia formed. For the next billion years, climate remained notably stable. This period of time from 1.8 billion years to 800 million years ago was called "The boring billion". During this period, supercontinent Rodinia formed, but broke apart. The rocks that became exposed sucked up more carbon dioxide from volcanoes, turning earth into a second snowball earth.
After that recovered, the two halves of Rodinia reunited around the South Pole forming supercontinent Pannotia. However, it broke apart during the end of the eon just as animals started to appear, as Laurentia rifted away from the rest of the supercontinent. Finally, the End-Ediacaran extinction event took place to end the eon.
During the beginning of this eon, cyanobacteria rapidly reproduced and photosynthesized turning a lot of carbon dioxide to oxygen. This oxygen reacted with the iron in the oceans, filling the oceans with iron rust BIFs, turning the oceans blood red. Later, there was no longer enough iron to hold onto the oxygen, and it escaped into the atmosphere. That oxygen formed the ozone layer. Nearly all of the carbon dioxide turned into oxygen, turning earth into a snowball earth.
The snowball earth quickly recovered after 300 million years. Then, supercontinent Columbia formed. For the next billion years, climate remained notably stable. This period of time from 1.8 billion years to 800 million years ago was called "The boring billion". During this period, supercontinent Rodinia formed, but broke apart. The rocks that became exposed sucked up more carbon dioxide from volcanoes, turning earth into a second snowball earth.
After that recovered, the two halves of Rodinia reunited around the South Pole forming supercontinent Pannotia. However, it broke apart during the end of the eon just as animals started to appear, as Laurentia rifted away from the rest of the supercontinent. Finally, the End-Ediacaran extinction event took place to end the eon.
Imagine living during the middle of the Proterozoic Eon! There would be no plants, no animals, just water, land and bacteria!
by thealtf4psychic March 30, 2021
Get the Proterozoic Eon mug.Pangea is by far the most famous and the most recent supercontinent. Spanning from the Pennsylvanian epoch, the second one in the Carboniferous period to the early Jurassic period, This supercontinent allowed animals and plants to spread and roam all over the land. It has been proven that fossils around this time were pretty much global and not restricted to specific continents. It formed with the closure of the Rheic Ocean and broke apart with the opening of the Atlantic Ocean.
Before Pangea, there were two continents called Laurasia and Gondwana (sometimes called Gondwanaland), and after Pangea broke apart, there were two continents too, also called well... Laurasia and Gondwana. The early Laurasia and Gondwana are sometimes called Paleolaurasia and Paleogondwana to prevent mixup of the names.
The name of Pangea originated from Greek where Pan means all and Gaia means earth. The name of Laurasia is made from concatenating the names of the Laurentia Craton (Today's North America) and Asia. Gondwana means "Land of Gonds (a tribe in India)".
Before Pangea, there were two continents called Laurasia and Gondwana (sometimes called Gondwanaland), and after Pangea broke apart, there were two continents too, also called well... Laurasia and Gondwana. The early Laurasia and Gondwana are sometimes called Paleolaurasia and Paleogondwana to prevent mixup of the names.
The name of Pangea originated from Greek where Pan means all and Gaia means earth. The name of Laurasia is made from concatenating the names of the Laurentia Craton (Today's North America) and Asia. Gondwana means "Land of Gonds (a tribe in India)".
Living in Pangea would be like living together with your friends wherever you go and not having to cross oceans with ships or planes.
by thealtf4psychic April 21, 2021
Get the Pangea mug.An MTR line that originates from its terminus at Kennedy Town and ends at its other terminus at Chai Wan.
History:
1985 - Island Line from Admiralty to Chai Wan is built, where Admiralty and Central are interchange stations with Tsuen Wan Line.
1986 - Island Line is extended west to Sheung Wan via Central.
1989 - Kwun Tong Line is extended across Victoria Harbour to Quarry Bay station.
2001 - Kwun Tong Line is further extended to North Point to relieve the congestion in Quarry Bay.
2002 - Tseung Kwan O Line takes over the section of Kwun Tong Line from North Point to just south of Lam Tin. The interchange stations remain in place.
2014 - Island Line is extended west to Kennedy Town, with a new station HKU.
2015 - Sai Ying Pun station is added later between HKU and Sheung Wan due to a construction delay.
History:
1985 - Island Line from Admiralty to Chai Wan is built, where Admiralty and Central are interchange stations with Tsuen Wan Line.
1986 - Island Line is extended west to Sheung Wan via Central.
1989 - Kwun Tong Line is extended across Victoria Harbour to Quarry Bay station.
2001 - Kwun Tong Line is further extended to North Point to relieve the congestion in Quarry Bay.
2002 - Tseung Kwan O Line takes over the section of Kwun Tong Line from North Point to just south of Lam Tin. The interchange stations remain in place.
2014 - Island Line is extended west to Kennedy Town, with a new station HKU.
2015 - Sai Ying Pun station is added later between HKU and Sheung Wan due to a construction delay.
by thealtf4psychic October 14, 2022
Get the Island Line mug.A very short lived supercontinent. It formed in the beginning of the Ediacaran period of the Proterozoic Eon, but broke apart as Laurentia rifted away from the rest of the supercontinent. It broke apart even before the Phanerozoic Eon and the Cambrian period. Not so well-known although is one of the only interesting things that happened during the Ediacaran period.
Bob reading out loud from a website: 630 million years ago, Pannotia formed.
Kate: Pannotia? Do you mean Pangea?
Bob: The Ediacaran supercontinent, not the Permian one.
Kate: I thought the only supercontinent was Pangea!
Bob: How about this?
Bob reading out loud from a website again: Pannotia was the result of supercontinent Rodinia turning inside out 720 million years ago.
Kate: ...
Kate: Pannotia? Do you mean Pangea?
Bob: The Ediacaran supercontinent, not the Permian one.
Kate: I thought the only supercontinent was Pangea!
Bob: How about this?
Bob reading out loud from a website again: Pannotia was the result of supercontinent Rodinia turning inside out 720 million years ago.
Kate: ...
by thealtf4psychic April 5, 2021
Get the Pannotia mug.An MTR line that originates from its terminus at North Point and ends at its two other termini at Po Lam and LOHAS Park, bifurcating at Tseung Kwan O.
History:
2002 - Tseung Kwan O Line from North Point to Po Lam is built, taking over part of the Kwun Tong Line, including its cross-harbour section, with North Point and Quarry Bay as interchange stations with the Island Line, and Yau Tong and Tiu Keng Leng as interchange stations with the Kwun Tong Line.
2009 - Tseung Kwan O Line from Tseung Kwan O to LOHAS Park is built, with Tseung Kwan O as the line's bifurcation station.
History:
2002 - Tseung Kwan O Line from North Point to Po Lam is built, taking over part of the Kwun Tong Line, including its cross-harbour section, with North Point and Quarry Bay as interchange stations with the Island Line, and Yau Tong and Tiu Keng Leng as interchange stations with the Kwun Tong Line.
2009 - Tseung Kwan O Line from Tseung Kwan O to LOHAS Park is built, with Tseung Kwan O as the line's bifurcation station.
by thealtf4psychic February 14, 2022
Get the Tseung Kwan O Line mug.by thealtf4psychic October 16, 2020
Get the Alt+F4 mug.This is the biggest SSR (Soviet Socialist Republic) of the Soviet Union, in both size and right. It is abbreviated P.C.F.C.P. (sometimes P.C.Ф.C.P. as the Russian Ф pronounces the same as English F) (originates from Russian form: Российская Советская Федеративная Социалистическая Республика) and R.S.F.S.R. Its modern counterpart is the Russian Federation since 1991.
Jim: I was born on December 11 1991 in the Russian Soviet Federative Socialist Republic, but only for one day. It became Russia the moment I was 1 day old.
by thealtf4psychic July 15, 2021
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