EOSC - Mass Extinctions

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Last updated: January 27, 2023

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First submitted	January 21, 2023
Times taken	10
Average score	46.5%
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Hint	Answer
Extinction 1	Late Ordovician
When	450 ma
How Much	60-70%
Why	ice age
Extinction 2	Late Devonian
When	360 ma
How Much	75%
Why	no oxygen
Extinction 3	End Permian
AKA	the great dying
When	251 ma
How Much	90-96%
Why	sea level fall
	pangaea
so it was ...	dry
	ocean stagnation
so there was ...	no oxygen
maybe there was a ...	impact
	siberian traps erupt
for ...	2 ma
and set fire to ...	oil
	gas
	coal
and released ...	ghgs
and so ...	temperatures increased
and so ...	clathrates melted
which...	release methane
After	triassic coal gap
plant diversity recovered by:	230 ma
	ecological space
so...	dinosaurs
Extinction 4	End Triassic
When	201 ma
How Much	70-80%
Who	over half of animals
	60% of plants
	ammonites
Index Fossil	conodonts
Why	unclear
	CAMP
which released ...	co2 and so2
maybe there were ...	impacts
After	dinosaurs take over

Hint	Answer
Extinction 5	End Cretaceous
AKA	K/Pg extinction event
When	66 ma
How Much	50%
specifically	80-90% marine
	half of plants
Why	asteroid impact
called the ...	alverez hypothesis
this is supported by the ...	iridium anomaly
there were also ...	soot
	fern spores
which indicated there were ...	forest fires
this would be located in the ...	chicxulub impact crater
which had ...	tektites
	shocked quartz
	suevite
this would have caused ...	vaporization
	lethal blasts
	broken ear drums
	shattered glass
	tsunami deposits
	disrupted rainfall
	tektite rain
	fire
	dust
would have resulted in ...	1% surface light
1	freezing temperatures
called an ...	impact winter
	no photosynthesis
	food chain collapses
after 1 ...	temperatures rose
because ...	limestones were vaporized
yucatan peninsula had ...	evaporites
like ...	gypsum
which lead to ...	so2 in the atmosphere
and then lead to ...	sulphuric acid rain
which ...	devastated primary producers
like ...	phytoplankton
what else happened?	deccan traps erupted
what doubled?	volcanic activity
what helped species survive?	hiding
	hibernating
which species could do that?	mammals

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