What element was found to be enriched in a thin clay layer marking the Cretaceous-Tertiary boundary at several sites around the world?
A) calcium
B) uranium
C) iridium
D) niobium
Correct Answer:
Verified
Q4: An asteroid or comet that strikes the
Q5: What would be the principal option for
Q6: Why are impact craters more common on
Q7: What is an aerial burst?
A)an explosion in
Q8: The shock wave resulting from meteorite impact
Q10: Why are ancient impact craters difficult to
Q11: The Tunguska event resulted from impact of
Q12: How big was the meteorite that apparently
Q13: A meteor is
A)a small comet
B)a large meteoroid
C)a
Q14: Most asteroids are found between Mars and
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