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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