Earth's interior
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Sea water is a mixture of many different chemical compounds and molecules.
this includes, but is not limited to, water (H2O), table salt (NaCl), dissolved oxygen (O2), Sulfur, Iodine, etc.
if you mean to ask what are the two elements that give "water", then hydrogen and oxygen (as per H2O above)
if you mean to ask what are the two major components of sea water, i would be inclined to answer water (H2O) and sodium chloride (NaCl, existing as dissociated ions within the water).
Sodium chloride, potassium chloride, magnesium chloride
Two sources of oxygen in seawater at the surface include atmospheric exchange, where oxygen from the air dissolves into the water, and photosynthesis by marine plants and phytoplankton, which produce oxygen as a byproduct.
The two main salts found in ocean salt water are sodium chloride (table salt) and magnesium chloride. These salts make up the majority of the dissolved solids in seawater.
These elements are transported by rivers to the sea. Another source is the volcanic activity.
The two different types of source are primary and secondary sources. Primary sources provide first-hand information, like original research or documents. Secondary sources analyze or interpret primary sources and provide commentary or analysis.