Precambrian

Precambrian Time: 4.6 bya - 544 mya

__Introduction __ Life on Earth before the [|Precambrian] was nothing but darkness, Earth hadn't even formed. The beginning of Earth happened ten thousand years after the the sun had formed. Gases and meteors came together to from it. If Earth had been any bigger or smaller then life might have not been able to form. After the "Ancient Beginning:" which started everything, the "Cambrian Explosion" Era happened. Multi-cellular organisms began to evolve, and all organisms were living under water. The first vertebrae evolved also, which made a huge impact on Earth today. But unfortunately, 95% of all the living things were extinct after the Cambrians mass extinction. The Precambrian lasted billions of years, and it's amazing how unicellular organisms eventually evolved into what we see today.

__Abiotic __ The continents back in the Precambrian were very different from today. Most of North America, like the North East and Massachusetts was underwater. Scientists believe that the oldest super-continent was formed 1100 mya. Continents were in totally different places. North America was in the center, South America in the east, The Earth's Atmosphere and Climate was very "un-livable" back in the Precambrian.

The atmosphere was made up of poisonous gases like methane, ammonia, hydrogen, carbon monoxide, and other harmful gases. Because life on earth began to form later on, oxygen was released into the atmosphere which eventually built up substantially. It's very hot, there's thunder, lightning and constant rain. Even the oceans are hot. Rodinia, one of the super-continents, split in half, making some land go to the North Pole, and some to the South Pole. Eventually this land came back together forming another super-continent called [|Pannotia] which later on broke up to make the contients we see today.

__Biotic __ <span style="color: #4f6228; font-family: 'Times New Roman',serif; font-size: 18pt;">We as humans wouldn't be here if life hadn't formed in the Precambrian time. Life hadn't shown up until 3.5 billion years ago. Bacteria was the 1st organism on Earth, and it was the only organism on earth for 1 billion years! Organisms started to evolve from the bacteria, like blue green algae called cyano-bacteria, that formed mounds called <span style="font-family: 'Times New Roman',serif; font-size: 18pt;">[|stromatolites] <span style="color: #4f6228; font-family: 'Times New Roman',serif; font-size: 18pt;">. Those were some of the first organisms to photosynthesize, therefore they helped put oxygen in the atmosphere. Bacteria today, <range type="comment" id="22521">is the most successful organisms on Earth. Later on in the Precambrian, small multi-cellular organisms started to evolve, like Dickinsonia which got up to 2-5 inches and formed around 600 million years ago.

__<span style="color: #5a392c; font-family: 'Times New Roman',serif; font-size: 18pt;">Rocks and Landforms __ <span style="color: #5a392c; font-family: 'Times New Roman',serif; font-size: 18pt;">The oldest rocks are nearly 4 billion years old. Rocks are found on almost every continent, but they aren't found in the northeast, because most of it was still underwater. They're mostly found in Canada. During this time, narrow strips of land were smashed together to form the beginnings of North America. "[|Proto"-North America] refers to the ancestral landmass which was gradually shaped into the North American continent we see today. <span style="color: #5a392c; font-family: 'Times New Roman',serif; font-size: 18pt;">Scientists have found fossils of single celled organisms in rocks. Stromatolite, Pteridinium Carolinaensis and Hadrophycus immanus fossils were found trapped in sediments and rock.

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