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The
BIG ONE
-
Layer
of iridium clay around world deposited 65 million years ago
-
Many
iron meteorites contain irridium
-
2/3
of all living species became extinct 65 million years ago
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A very
large meteorite may have struck the near the Yucatan peninsula
-
impact
may have kicked up dust that obscured the sun
-
plants
died
-
large,
cold blooded animals died
-
mammals
survived
-
Can
it happen again?
Irridium
rich clay
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