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A 10mm sized object (about half the size of a $2:00 )would loose most of it's velocity by the time it had travelled through the 100 kms+ very cold atmosphere, they are travelling at aprox 60 t0 80 kms/sec when they enter the atmosphere, if they survive the journey they, being so small by the time it touches the ground it would quite cool,.
To retain enough heat to course so much damage in my opinion is very doubtful
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