| http://www.w3.org/ns/prov#value | - ntender is Formaldehyde (CH2O), which is present in minute amounts in the atmosphere, but has a melting point of 181K (-92C, -134F) and a boiling point (at 100KPa - earth sea level pressure) of 254K (-19C, -2F).Thus, it may be that either early in its life Mars did, for a short while, have a climate that included liquid water; or that some sort of combination of chemicals e.g. a carbon dioxide - f
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