An ironsmith, look out for freshly cut surfaces of metal rods to see if they have luster. What other process can be used to see if a material has luster or not? *
a) Heat the material
b) Wash the material with water
c) Rub the surface of material with sand paper
d) Allow the material to remain exposed to air for some time
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The green substance that helps leaves trap energy from sunlight
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Rub the surface of material with sand paper
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