The Climate and Continents
The precambrian time took place from when earth first formed (4.6 BYA) to 543 MYA. Back then the crust was hot and hadn’t cooled. When it finally cooled, it was still hot but very humid. The carbon dioxide back level was FIVE TIMES more than it is today! That means that it was much, much hotter. As the era kept going on, the temperature was unstable and it switched between hot and cold. As you may have assumed, the continents were very different to. At the beginning of the time period, small continents grouped to together to form the supercontinent Rodinia. Rodinia was located to the west of the prime meridian half over and half under.
The Animals and Plants
Life started out slow in the beginning but soon picked
up. Evidence of life was found dating back to 3850 mya. The life soon evolved and eventually wormlike creatures were found on land. Plants began as photosynthesizing bacteria floating on the surface of the water. The bacteria eventually moved to land in large mats that grew. At the end of the time period there was a mass extinction called the Vendian extinction. Single celled algae and soft bodied animal were affected by it. Scientists believe that oxygen depletion and water level changes were to blame. At the end of the time period Rodinia broke apart and started to form Pannotia.
The precambrian time took place from when earth first formed (4.6 BYA) to 543 MYA. Back then the crust was hot and hadn’t cooled. When it finally cooled, it was still hot but very humid. The carbon dioxide back level was FIVE TIMES more than it is today! That means that it was much, much hotter. As the era kept going on, the temperature was unstable and it switched between hot and cold. As you may have assumed, the continents were very different to. At the beginning of the time period, small continents grouped to together to form the supercontinent Rodinia. Rodinia was located to the west of the prime meridian half over and half under.
The Animals and Plants
Life started out slow in the beginning but soon picked
up. Evidence of life was found dating back to 3850 mya. The life soon evolved and eventually wormlike creatures were found on land. Plants began as photosynthesizing bacteria floating on the surface of the water. The bacteria eventually moved to land in large mats that grew. At the end of the time period there was a mass extinction called the Vendian extinction. Single celled algae and soft bodied animal were affected by it. Scientists believe that oxygen depletion and water level changes were to blame. At the end of the time period Rodinia broke apart and started to form Pannotia.