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  • Precambrian Time- Happened 4.6 billion years ago is the earliest thing to be recorded that happened on earth.  When Earth began to form Big Bang Theory occurred, Also how igneous rock formed from the volcano eruptions. And metamorphic rock which was close to melting rock which where metamorphic rock then makes.
  • Plate Tectonics – 3 billions years ago Earth’s surface divided into plates  
  • Ozone Layer- Started forming about 2 billion years ago. The stratosphere protects the earths surface from harmful UV rays.
  • Plant Life- was known to 700 million years ago. This is what brought fresh air into the air.
  • Ice Age- It happened 570 million years ago and it was thick ice that covered many lands.
  • Cambrian Period – 541 million years ago Fossil Records from Cambrian sedimentary rocks                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
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