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what could have wiped 3km of rock off the entire earth?
cambrian explosion
geology
plate tectonics
science
snowball earth
technology
source
the earth nearly froze over when today’s coal was first buried
climatology
earth science
greenhouse gasses
pangea
science
snowball earth
technology
source
the origin of complex life on earth just got a little less mysterious
cryogenian period
eukaryotes
evolution
multicellular life
science
snowball earth
technology
source
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