Question

multiple - choice question
what does the burning by the heat cause?
nothing
the existing rocks will change into something new (metamorphic rock)
the existing rocks will become igneous rocks.
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Explanation:

When rocks are subjected to heat (and often pressure), they can undergo metamorphosis. Metamorphic rocks are formed when existing rocks change due to high - temperature and high - pressure conditions. Igneous rocks are formed from the cooling and solidification of magma or lava, not directly from the 'burning' of existing rocks by heat in the context of metamorphism. And clearly, the heat does cause a change.

Answer:

The existing rocks will change into something new (metamorphic rock)