This is a graph of the temperature during PreCambrian Time.
PreCambrian Time
Precambrian Time began 4.550 bya and ended 543 mya. It was the first time period on Earth (and the longest). When planet Earth first formed it was HOT, finally, after 5 million years asteroids stopped pelting the planet and the crust was able to cool. After several million years of constant rain, Earths surface was much safer. 250 bya the supercontinent Rhodinia formed, modern-day North America was right in the middle with modern-day South America, Australia, and Antarctica surrounding it. 350 million years after Rhodinia formed it split in half, one part going to the North Pole, the other to the South Pole, 150 million years after that it rejoined forming the second supercontinent, Pangea. Moving tectonic plates collide with each other causing earthquakes and forming huge mountain ranges and volcanoes. The first EVER life on Earth was single-celled bacteria, later microbes that fed on organic molecules such as glucose appeared. 900 mya soft-bodied animals that were big enough to see without a microscope became plentiful yet by 550 mya they were scarce. in 565 million year old rocks, fossils of leafy fronds were found. The Vendian Extinction ended Precambrian Time. It caused all single-celled algae and soft-bodied animals to go extinct. Scientists hypothesize that this extinction was caused by sea-level changes and oxygen depletion.
This is a leafy frond
This is a soft-bodied animal that is big enough to see without a microscope
This is a globe showing Rhodinia splitting.
The shape of the continents during Precambrian Time