Question

question 31 thermal (contact) metamorphism produces foliated rocks only. both foliated and non - foliated rocks. non - foliated rocks only. thermal metamorphism does not produce any metamorphic rocks.

Explanation:

Thermal (contact) metamorphism can result in both types of rocks. When minerals recrystallize under heat from an igneous intrusion without significant pressure - differential, non - foliated rocks like hornfels can form. But in some cases with additional factors like slight pressure or preferred orientation of minerals during recrystallization, foliated rocks can also be produced.

Answer:

both foliated and non - foliated rocks.