text: So the author uses many key ways of proving their point. They used problem solution to further their reasoning. As well as examples and descriptive eveidence to show us what exactly was happening. Finally they used facts to help persuade us that this is worth studying. That is how the author proved that studying Venus is worth it even with the risks involved.The face is just a natural landform and it couldnt have been made by aliens for certain reasons and here is why. There were no living creatures to be found anywhere on mars. Even in the last paragraph it said it reminded Garvin of most of