when did pangea break up
~ during the triassic period
the atlantic began to open during which period
~ the jurassic, polar ice caps had completely melted at this point
the T rex is from what period
~ the cretaceous
small mammals developed in what period
~ the cretaceous
the cretaceous-terti...
✓✓✓✓~ it has a very long half life and can be found in many minerals
why would you date with carbon 14
✓✓✓✓~ it can date more recent geologic events because of its shorter half life
what makes the Hadean Eon special
✓✓✓✓~ there was no life on earth (4.6-4 billion years), this is the eon where the earths
crust and internal iron core formed,water formed in the first 100-200 million years
from out gasing and comets
when was the first life on earth
✓✓✓✓~ 4 billion years ago
, what is significant about the archean eon
✓✓✓✓~ there was constant volcanic activity, no oxygen, acidic oceans, and bacteria are
forming which then produce oxygen
*note oxygen only gets released at end of the archean
describe archaea
✓✓✓✓~ a cell without nuclei, and an extremophile it lived in high temps. and oxygen lacking
environments
archaea colonies are called
✓✓✓✓~ stromatalites
how long ago was the archean eon
✓✓✓✓~ 4-2.5 billion years ago
the proterozoic eon began what age
✓✓✓✓~ the age of oxygen, this caused a mass extinction of bacteria that fed on CO2
the great oxygenation event happened when
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