Under which situtions can be amorphous substance change to crystalline

1.	Under which situtions can be amorphous substance change to crystalline form ?
Answer» As a RESULT of slow heating and COOLING over a long period, an amorphous solid ACQUIRES some crystalline CHARACTER e.g., window glass of old buildings. Answer :`(i) to ©, (ii) to (a), (III) to d, (iv) to b `

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