Identify the reaction type shown and describe the clues that were used to identify it. fe2o3 + 2sio2 → fe2si2o7

The answer is synthesis reaction

The explanation:

when synthesis reaction or direct combination reaction is a type of chemical reaction in which two or more simple substances combine to form a more complex product. The reactants may be elements or compounds. The product is always a compound

and we here

Fe2O3 + 2SiO2 → Fe2Si2O7

Fe2O3 is combined with SiO2 and form a more complex product Fe2Si2O7

so this is a synthesis reaction.