Is coal natural or man-made?, natural, Is sand natural or man-made?, natural, Is glass natural or man-made?, man-made, What is glass made from?, sand, Is plastic natural or man-made?, man-made, What does transparent mean?, You can see through it, What does translucent mean?, Light goes through it., What does opaque mean?, You can't see through it., What are the 3 states of matter?, solids, liquids and gases, What is water in solid form?, ice , What is water in liquid form?, water, What is water is gas form?, steam.

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