How do we know some rock layers are 'extra-terrestial?'

Subject: How do we know some rock layers are 'extra-terrestial?'

Date: Tue Dec 8 10:01:49 1998
Posted by William Peltz
Grade level: No grade entered.
School: No school entered.
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Area of science: Earth Sciences
ID: 913132909.Es

Message:


How do we know some rock layers are 'extra-terrestial?' 
As in interstellar dust.  The students recently read an article 
that used this term; they know the same elements are found in the 
dust (and sedimentary layers) as are commonly found on Earth, and 
do not understand how we can tell the difference between 
terrestial and non-terrestial sediments.

Re: How do we know some rock layers are 'extra-terrestial?'

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