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Re: deep water = less ejecta?

How deep is deep, do they say? If the top of the bolide is still in the
stratosphere while the bottom is kissing the ground, the water would have to
be pretty deep to have much cushioning influence. Two kilometers? Breached
in a tenth of a second?
----- Original Message ----- 
From: "john bois" <jbois@verizon.net>
To: <dinosaur@usc.edu>
Sent: Friday, January 25, 2008 7:01 AM
Subject: deep water = less ejecta?

> OK...so the Chicxulub crater is shallow because the bolide hit in deep
> water...thus sending massive water into the atmosphere and, at the same
> time, cushioning the blow to underlying solid materials.  Do we now have
> downgrade the amount of re-entering ejecta and associated fire storms,
> pulse, and toasting as a killing mechanism?