Coupling the unfamiliar with the familiar can a child cope with

fear

Explanation:

According to my research on studies conducted by various psychologists, I can say that based on the information provided within the question doing this would help a child cope with fear. This is because individuals have the tendency to fear the unknown/unfamiliar, since they cannot understand or relate to what they do not know and therefore fear it. This is emphasized in children because they are still learning/experiencing the world and therefore many common or familiar things for adults are still unfamiliar to a child and therefore causes them to be afraid of it, so coupling it with something that they are familiar with would remove the fear aspect of learning.

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it cools slower in the earth meaning the crystals have more time to form than lava on the surface