answer: #Person1# tells #Person2# that there is water on Mars buried beneath the surface. The soil would need quite a bit of fertilizer to grow anything. One of the most exciting things about Mars is that there could have been life on it. #Person1# is skeptical about the assumption that Mars may be inhabitable by humans since it's so different from the earth.
documents: #Person1#: I'm reading an interesting report on Mars. 
  #Person2#: Oh, what does it say? Does it say water could still exist under the surface of Mars? 
  #Person1#: Absolutely! It says there is water on Mars buried beneath the surface. It's just a matter of how deep it is. 
  #Person2#: Then could the soil on Mars somehow be fertile enough to groh simple plants? 
  #Person1#: The soil would need quite a bit of fertilizer to grow anything. And it would need to be protected from the UV radiation. 
  #Person2#: Actually, we are doing a project in school that involves landing a ship and staying on Mars for an extended period of time. Doef NASA have any type of portable habitats that could be used to stay on the planet? 
  #Person1#: I'm not sure NASA has built any porteble habitats for extended stays on Mars , but they have looked at various designs. 
  #Person2#: One of the most exciting things about Mars is that there could have bean life on it. What are your personal opinions on the life on Mars theory? 
  #Person1#: Well, I'm not really an expert in this area, but my understanding is that anything is possible. It's just that it is so hard to determine what went on 4. 5 billion years ago. 
  #Person2#: But maybe there is a chance of gradually improving the surface and atmosphere of Mars so it may be inhabitable by humans. 
  #Person1#: I'm skeptical. Mars is made of rocks containing silicon,iron, and various minerals. It also has an atmosphere of carbon dioxide. It is so different from what we have on earth, you know. 
  #Person2#: I'd still like to hope that some day we could set up a human colony there. 
  #Person1#: But there are still other big problems we need to solve such as prolonged weightlessness, food storage, and a series of physiological effects.