Conclusion: Main findings
Atmosphere is cold enough for both water and CO2 ice clouds
Mars crust has more iron than Earth
Soil does not come from local rock weathering, implies wind redistribution of soil
Sand implies extensive water weathering
Mars “awash” with abundant liquid water 3 to 4.5 billon years ago
Wind erosion is the dominant force at work now
Seasonal pressure fluctuations more extreme than on Earth