Scientists are hoping to solve the mystery of why the dinosaurs became
extinct by examining fossilized leaves that grew around the time the
dinosaurs died off.
Alth
many bel
that t
extinction w
triggered b
an imp
from ou
space, oth
blame ot
causes, li
a fl
of la
set o
by volc
in In
.
Studying t
leaves how
, has reve
a hu
increase i
CO2 i
the a
which , scien
say i
best expl
by t
vaporization o
limestone bed
caused b
meteor imp
. This mir
other find
of glo
warming a
that ti
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