| 11. | The rock sample Maddox found turns out to be a fragment of the Tyrannosaurus.
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| 12. | Changes in temperature and pressure, and composition alter the mineralogy of a rock sample.
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| 13. | NASA hopes to bring rock samples back home in 2005.
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| 14. | Rock samples taken from Llullaillaco are mostly porphyritic or matrix.
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| 15. | Also, rock samples from the upper reaches of Everest were carried back for further study.
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| 16. | The University's Austin and Midland centers house more than 1.2 million boxes of rock samples.
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| 17. | NASA is planning two missions to Mars, in 2001 and 2003, to collect rock samples.
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| 18. | Calvin's lab was developing methods to be used in the analysis of lunar rock samples.
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| 19. | Overall rock samples range from basalt to rhyolite in composition and are mostly of calc-alkaline composition.
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| 20. | He does, however, find an interesting rock sample.
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