• philcsy
    #42
    A felszín alatti agyag ásványokról:
    http://www.nasa.gov/mission_pages/MRO/multimedia/pia14764.html
    http://www.nasa.gov/home/hqnews/2011/nov/HQ_11-369_Martian_Clay.html
    http://www.nasa.gov/mission_pages/MRO/news/mro20111102.html