However, "if there ###### been [volcanic activity in] 4 ###### years, ... it would be ###### difficult to believe there was ###### left on Mars."
To settle ###### question, Desmond Moser of Western ###### in Ontario, Canada had his ###### examine a meteorite known as ###### Africa 5298. They looked at ###### tiny deposits within it called ######. These tough, zirconium-rich minerals are "###### times smaller than the diameter ###### a human hair," said study ###### Axel Schmitt, a geochemist at ###### University of California, Los Angeles.

A Tough Tiny Mineral In Meteorites

###### generally measure relative amounts of ###### of radioactive elements in rocks ###### gauge how long a rock ###### been around since it fully ######.]]> "It looks good on ###### outside, but all the pieces ###### dislodged on the inside," Schmitt ######. The study further shows that ###### shergottites weren't old rocks, Humayun ######. But that was what he ###### expected." If they had found ###### it was 4 billion years ######, I would eat my hat," ###### said.]]>