If you are going to a swamp like the one in (A), make sure you bring your boots because swamps are full of mud and organic material. The organic material comes mostly from plants that have died. Over millions of years this carbon-rich mixture may be preserved as a bed of coal like the black layer in (B). Do you see the opening cut into the layer of black coal? That is the entrance to an old coalmine.
, focuses on rocks and minerals, including articles on minerals and mining, the use of minerals in society, and rare earth minerals, and includes 3 posters!
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