text: Another reason for the Face on Mars to be just a natural landform is because of no real proof leading to aliens being there. The passage states that no aliens have interloped the area or anything. The text showed that overtime the face has deceased of showing up. The Garvin states that the Face has come down to looking like "Middle Butte in the Snake River Plain of Idaho, that's a lava dome that takes the form of an isolated mesa about the same height as the Face on Mars."