Given a scientific passage and an answer, generate a question for the given answer.

Ex Input:
Passage: The composition of the magma determines if the rock is mafic, felsic, or intermediate. Answer: intermediate

Ex Output:
The composition of the magma determines if the rock is mafic, felsic, or what?

Ex Input:
Passage: The two materials do have at least one thing in common. The atoms in the materials are held together by covalent bonds. These bonds consist of electrons shared between two or more atoms. Unlike ionic bonds, where electrons are either lost or gained by an atom to form charged ions, electrons in covalent compounds are shared between the two atoms, giving rise to properties that are quite different from those seen in ionic materials. Answer: ionic bonds

Ex Output:
Electrons in covalent compounds are shared between the two atoms, unlike the case in what type of bonds?

Ex Input:
Passage: Stars shine because of nuclear fusion. Fusion reactions in the Sun's core keep our nearest star burning. Stars are made mostly of hydrogen and helium. Both are very lightweight gases. A star contains so much hydrogen and helium that the weight of these gases is enormous. The pressure at the center of a star is great enough to heat the gases. This causes nuclear fusion reactions. Answer: nuclear fusion

Ex Output:
What process, which results because of great pressure at the center of a star, causes stars to shine?