What elements caused the explosion at Chernobyl in 1985

extreme pressure increases along with design malfunctions.

Explanation:

the main reason for its explosion was because of human error but it was mostly because of a sudden power surge within the plant, it begin when they started reducing power at reactor No. 4 when they were trying to run the safety test, they had also turned off the plants cooling system so that it didnt interfere with the testing.the reason for the power surge being the peculiarity design of the control rods that were they inserted into the reactor another reason was because of the poor construction materials that were used to build this plant,

therefore it was a  result of a flawed reactor design that was operated with inadequately trained personnel. and a sudden power surge is what caused the disaster

Explanation:

the correct answer is the name of the author of the quotation appears at the text leading up to it   apex 2018