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At point X, only the air that is in direct contact with the sand is heated. And at point Y, only subsurface sand that is in direct contact with the hot surface sand can gain heat. This means that mostly _______ is occurring at points X and Y.

User Ammad Ali
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its heat hope this helped
User Ming Liu
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Answer: Conduction

Step-by-step explanation:

User Oxygenan
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