Melted rock can ooze out from below the earth's surface through a crack called a fault.
Answer:
Scientist used models to explain and predict the behavior of real object or system
The molecular structure of the solids has lower ability to conduct electricity due to tight holding by nucleus.
<h3>Why molecular solids are poor conductors?</h3>
Molecular solids are also poor conductors of electricity because their valence electrons are tightly held by the nuclear charges present in the nucleus while on the other hand, Metals are good electrical conductors in the solid form due to the presence of free electrons that helps in the conduction of electricity.
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As the air molecules move through the valve they have friction as they hit the walls, and its this friction that causes it to heat up.