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 ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.