coal deposits occur in layers each such layer is called a ''seam ''
Resimler
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- coal deposits occur in layers each such ..
- a principle of design, where an element ..
- act or instance of variation; divergence..
- a separation from worldly objects; a rec..
- the use of one's own resources to raise ..
- the lightest element in the universe, co..
- a horizontal movement of the camera from..
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