When glass is formed, which of these takes place first? a) the sand turns to liquid. b) the molecules become hard. c) the sand is heated intensely. do) the molecules become disordered.

I would say D and if that's not it it's A

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The correct answer would be option C) The sand is heated intensely. A would be incorrect because the sand does not just turn into liquid. B would be incorrect because how would the molecules become hard. D is incorrect because this step comes after the heat.

the movement of aircraft through clouds can even cause lightning strikes. a single lightning event is a "flash", which is a complex, multi-stage explosively ejected.

explanation:

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acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.