Brownie
...to obtain energy through photosynthesis. After that was the Paleozoic Era which has six different periods. The First one was the Cambrian Period which was formed 540-490 million years ago. Sedimentary rocks formed in shallow seas over the continents. Multiple collisions of the Earth's plates gave rise to a continent called Gondwana. It includes South America, Africa, Antarctica, and Western Australia as well as peninsular India and parts of Arabia. The second one is Ordovician Period which formed 490-443 million years ago. That’s when North America, Europe, and Africa combined. Then low seas covered much of North America at the beginning of the period, then returned, leaving a thick layer of limestone. The third period is the Silurian Period which formed 443-417 million years ago. During this period the continents North American, Europe, and Asia were located by the equator. There was shallow flooding on the continents and when the ocean water left the continents it left salt from the water causing salt deposits, red beds, and rocks. The next period in this era, the Devonian Period, occurred 417-354 million years ago. The Appalachian mountains formed when Europe and North America came together. The next period in this era, the Carboniferous Period, occurred 354-290 million years ago. Two major land’s were formed north of the equator. Leaving a gap of glaciations. The next period, Permian Period , formed 290-248 million years ago. All of the c...