1. Mars

2. https://youtu.be/nCUipx1bhWM

3. “These veins are composed mainly of hydrated calcium sulfate, such as bassinite or gypsum,” said ChemCam team member Nicolas Mangold, of the Laboratoire de Planétologie et Géodynamique de Nantes, in Nantes, France. “On Earth, forming veins like these requires water circulating in fractures.”

4. https://youtu.be/2aKXT3Rn79s

5. Tracks need water to stay formed
Tracks need water to stay formed. Or sharp edges, like on the moon; but we know the sand particles are round.

6. APOD from 2010 August 30 
The mound in question, dubbed Comanche Outcrop and visible near the top of the above image, appears to contain unusually high concentrations of elements such as magnesium iron carbonate. The above image is shown in colors exaggerated to highlight the differences in composition. Since these carbonates dissolve in acid, the persistence of these mounds indicates that water perhaps less acidic and more favorable for life might have once flowed across Mars. 

10. Limestone