answer: #Person1# and #Person2# are hiking in the mountain, and they are watching the animals, plants, and natural sceneries there.
documents: #Person1#: It's wonderful to be in the mountains after a hustle bustle week.
  #Person2#: Indeed. I love the smell of the grass and trees. They certainly refresh my mind.
  #Person1#: Can we stop here for a while? My backpack is very heavy.
  #Person2#: Sure. Did you hear anything? Look! An eagle is hovering in the sky.
  #Person1#: Let me see. It's not an eagle. I think it's a vulture.
  #Person2#: Yes. Will it hurt us?
  #Person1#: I don't think so. Let's walk by the stream. I am sure we can find the waterfall on the map.
  #Person2#: OK. I have a good pair of hiking boots. It should not be a big problem.
  #Person1#: I also brought a bottle of water and some provisions. If you are hungry, you can let me know.
  #Person2#: You are kind. Look there is a big tree over there, it looks like a thousand-year-old tree.
  #Person1#: Well, it is a birch tree. It is not as old as you think.
  #Person2#: How do you know?
  #Person1#: Because its trunk is not thick enough to be like a thousand-year-old tree.