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Carbon and hydrogen
Oxygen and silica
The top two elements in the Earth's crust as a percentage are:Oxygen--47%Silicon--28%
The two elements that make up steel are iron and carbon. Other elements can also appear in the steel, but these two are the ones that cause it to be called steel.
Hydrogen and helium.
The main elements of lpg are, butane , methane(CH4) and etyl mercaptan.
The two most abundant elements in a main sequenced star are Hydrogen(H) and Helium(He).
The two elements that commonly occur within the earth crust are Oxygen and Silicon.
These elements are (in the Earth crust): Si, Al, O, Ca, Mg, Fe, Na, K, H, C, Ti, P.
These elements are (in the Earth crust): Si, Al, O, Ca, Mg, Fe, Na, K, H, C, Ti, P.
Carbon and hydrogen
Oxygen and silica
Hydrogen and helium
mainly water ,they are two basic elements of combustion.
There are at least two possible answers to this question. The two most usual ones are probably: metals, nonmetals, and metalloids; or main group, transition elements, and inner transition elements.
Fire, Water, Metal , Wood and Earth