oxygen used 2 (b) any from produces (calcium) carbonate which is insoluble produces (calcium) hydrogencarbonate is soluble photosynthesis releases oxygen 3 [5] M35. (a) (i) nitrogen (gas) or N2 if only the formula is it must be correct in every detail 1 (ii) argon (gas) or Ar 1 (iii) oxygen (gas) or O2 1 (b) vapour 1 evaporating 1 sea(s) 1 condenses 1 (c) volcanoes or volcanic activity or the sea(s) allow carbonates(s) (rocks) do not credit inside 1
oxygen used 2 (b) any from produces (calcium) carbonate which is insoluble produces (calcium) hydrogencarbonate is soluble photosynthesis releases oxygen 3 [5] M35. (a) (i) nitrogen (gas) or N2 if only the formula is it must be correct in every detail 1 (ii) argon (gas) or Ar 1 (iii) oxygen (gas) or O2 1 (b) vapour 1 evaporating 1 sea(s) 1 condenses 1 (c) volcanoes or volcanic activity or the sea(s) allow carbonates(s) (rocks) do not credit inside 1
c1_atmosphere_mark_scheme.docx