Linear mountain chains show us where continents

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linear mountain chains show us where continents collided Himalayas: india crashing into asia This shows us were bits of scraps of continents must have stuck together Cratons: oldest continents
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Orogens: boundaries between cratons, remains of eroded mountain chains Greenville orogeny mountains: runs up east coast of US: 1.6 billion years old Tells us that about 1.5 billion years ago all continents were stuck together called Rodinia which existed before Pangea o Broke apart again to make ocean again then crashed again to make Pangea then opened again and made Atlantic Tuzo Wilson hypothesis the Wilson cycle: that the every 500 million years Atlantic is closing into one gigantic super continent than you break apart and cycle repeats 600 million years ago multicellular life occurs o becomes blobs instead of slime at bottom of ocean: ediacran fauna: multicellular animals: not related to any current animals Paleozoic: Old Life o Bug life and we make prototype of all modern life on earth o Cambrian Explosion: explosion in life and biodiversity At end of precombrian we have the blob things, and at the beginning of the Paleozoic we see establishment of diverse ecosystems of things that look like animals Trilobites: most successful type of animal, one of top animals for 250 million years 17,000 diferent species: o rodinia breaks apart but then throughout the Paleozoic the fragments of rodinia slowly reform into Pangea the Appalachians are formed during this closing during this time first land plants appear the first fish evolve during the early Paleozoic: no fins and no jaws jaws and fins do quickly appear though : the dunkleosteus: 30 ft 3.5 tons o on land plants become vascular: tubes to carry things around allows them to become as large as they are today: stuf underground to suck up water and minerals o the first land animals appear: millipedes: and soon insects and scorpions o fins become legs during the late Paleozoic and the first amphibians appear from these evolve the reptiles and mammal like reptiles: dimetrodon: an early mammal like reptile: by the end of the Paleozoic: mammal like reptiles have become much more mammal like: they lay eggs, etc soon a volcano occurred, the biggest known and the flood basalts may have covered up to 7 million
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the Permian Triassic extinction event: kills 96% of everything on land and 70 this event allows reptiles to largely replace reptile like mammals they are related to crocodiles but are not dinosaurs there are dinosaurs during this Mesozoic period but they are small o this happens because we have Pangea and we start breaking it apart and start getting volcanoes we get the central atlantic magmatic volcano therapods and then birds evolve from dinosaurs: the carnivorous ones during dinosaurs time flowers evolve: flowers are dominant plant on earth even grass is a flowering plant o they kill of the stegosaurs because they are trickier to eat o a t rex shows up during this time o dinosaurs dominate Mesozoic: 180 million years
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