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This Concept Map, created with IHMC CmapTools, has information related to: 2015-knowledge-engine-1, Mars hardly contains O2 (ɘ.1%), Earth contains O2 (ᡌ%), Earth contains Hydro-carbon, Earth hardly contains CO2 (ɘ.05%), Mars does not contain Hydro-carbon, Mars contains Mg, Mars contains CO2 (ᢗ%)