I am metamorphic rock, dark grey in colour. i am used in making roofs and blackboards
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Answer:
Slate is the metamorphic rock that is grey in color and is used to make black boards and roofs.
Explanation:
Slate is used in making roofs through its product which is a tile made from slate.
Slake originates from clay grains. When making roofing material fro slate, the rock is professionaly cut to give rise to a smooth, thin large surfaced sheeet that is used for roofing.
This material also can be used to make class rom writting surfaces which are known as blackboards.
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