Earth's Ancient History by Kella Randolph https://padlet.com/kella_randolph/fs3x4okjmcym Continents, oceans, early life en-us 2016-10-17 20:13:43 UTC 2025-06-20 18:56:37 UTC hello@padlet.com An asteroid kella_randolph https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131304198 hit near the Yucatan Peninsula gouging out a huge crater.]]> 2016-10-17 20:24:30 UTC https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131304198 Cyanobacteria  kella_randolph https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131304688 developed near deep hot ocean vents. It could photosynthesize, creating oxygen.]]> 2016-10-17 20:26:48 UTC https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131304688 The Paleozoic Era is called" the age of ancient life" kella_randolph https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131318665 2016-10-17 21:53:07 UTC https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131318665 Pangea kella_randolph https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131319096 Wegner's theory that all land was once joined.]]> 2016-10-17 21:56:35 UTC https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131319096 Dinosaurs first appeared during the Triassic Period.  kella_randolph https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131319576 2016-10-17 22:02:08 UTC https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131319576 Mass extinctions kella_randolph https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131319916 There have been several over time. When Pangea formed a mass extinction wiped out about 90% of all marine life. ]]> 2016-10-17 22:05:45 UTC https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131319916 The Geologic Time Scale is determined by radiometric dating and depth that fossils are found.  kella_randolph https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131320310 2016-10-17 22:10:02 UTC https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131320310 Seven billion humans now live on Earth.  That puts a strain on the sharing of resources. kella_randolph https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131320503 2016-10-17 22:12:08 UTC https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131320503 Recorded history only began about ,000 years ago.  Humans have lived on Earth at least 200,000 years.  What took them so long? kella_randolph https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131320776 2016-10-17 22:14:49 UTC https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131320776 Plants evolved 400 million years ago.  kella_randolph https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131321082 2016-10-17 22:18:08 UTC https://padlet.com/kella_randolph/fs3x4okjmcym/wish/131321082