Multiple Choice
The 1-cm-thick clay layer that marks the Cretaceous/Paleogene (K/Pg) boundary has a high percentage of the element ________ in the clay layer,an enrichment about 300 times greater than the normal abundance.
A) iridium
B) silicon
C) iron
D) oxygen
E) krypton
Correct Answer:
Verified
Correct Answer:
Verified
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