Google Answers: astronomy

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Q: astronomy ( Answered, 0 Comments )

Question

Subject: astronomy
Category: Science > Astronomy
Asked by: player55-ga
List Price: $2.00

Posted: 29 Mar 2003 19:43 PST
Expires: 28 Apr 2003 20:43 PDT
Question ID: 183062

How do we know that Mars' liquid water disappeared long ago?
A) there is no rain today
B) our oceans fromed long ago
C) from crater counts
D) radiactive dating
E) fossil remains

Answer

Subject: Re: astronomy
Answered By: robertskelton-ga on 29 Mar 2003 20:04 PST

Hi again,

The answer is:

C) from crater counts

Besides the evidence for an ancient ocean, there is evidence for
ancient flooding river channels. That these features are ancient is
indicated by the number of craters which are superimposed.
http://www.physics.utoledo.edu/~lsa/_a1010/mod17.htm


Search strategy: University of Toledo again


Best wishes,
robertskelton-ga

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