QUOTE (danielost @ Jun 10 2008, 05:16 PM)

you also get sulfuric acid. don't believe me look at venus.
some where in it's recent past all or most of it's surface became magma turning the water on the surface into sulfuric acid, steam, co2. causing a runaway greenhouse.
There's a lot more on Venus than water and magma, I can tell you that. Water+magma does not equal sulfuric acid.
(
http://en.wikipedia.org/wiki/Sulfuric_acid )
"Occurrence
Pure undiluted sulfuric acid is not encountered on Earth, due to sulfuric acid's great affinity for water. Apart from that, sulfuric acid is a constituent of acid rain, which is formed by atmospheric oxidation of sulfur dioxide in the presence of water, i.e., oxidation of sulfurous acid. Sulfur dioxide is the main byproduct produced when sulfur-containing fuels such as coal or oil are burnt.
Sulfuric acid is formed naturally by the oxidation of sulfide minerals, such as iron sulfide. The resulting water can be highly acidic and is called Acid Mine Drainage (AMD). This acidic water is capable of dissolving metals present in sulfide ores, which results in brightly-coloured, toxic streams. The oxidation of iron sulfide pyrite (FeS2) by molecular oxygen produces iron(II), or Fe2+:
2 FeS2 + 7 O2 + 2 H2O → 2 Fe2+ + 4 SO42− + 4 H+
The Fe2+ can be further oxidized to Fe3+, according to:
4 Fe2+ + O2 + 4 H+ → 4 Fe3+ + 2 H2O
and the Fe3+ produced can be precipitated as the hydroxide or hydrous oxide. The equation for the formation of the hydroxide is
Fe3+ + 3 H2O → Fe(OH)3 + 3 H+
The iron(III) ion ("ferric iron", in casual nomenclature) can also oxidize pyrite. When iron(III) oxidation of pyrite occurs, the process can become rapid. pH values below zero have been measured in AMD produced by this process.
AMD can also produce sulfuric acid at a slower rate, so that the acid neutralizing capacity (ANC) of the aquifer can neutralise the produced acid. In such cases, the total dissolved solids (TDS) concentration of the water can be increased form the dissolution of minerals from the acid-neutralisation reaction with the minerals."
Gee,
nothing about magma.