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Your best friend in another town has joined grade eleven this year. S/he is also studying through virtual medium like you. Write a letter to him/her sharing your experiences and suggest him/her some valuable conducts of students during online classes to make learning effective.

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The sodium sulfate can generate larger crystals for the combination with the water solution with a monoclinic form in the decahydrate form. When the temperature of Page 20 9 sodium sulfate exceeds 33°C, the morphology and the structure of the crystal change, and the sodium sulfate become anhydrous.

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Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. ... Coal is formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years.

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