raw specimen rhyolite extrusive igneous rock stone geologist hand |
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| navigate by keyword : 39aph39 39next 456 age andesite art asphalt attach background ballast bedrock black boulder carbon civil close coal contexts crush engineer engineer39aph39s erupted extrusive floor flooring formation formed fossil fragment fuel geologist geologist39aph39s geology granite hand hard igneous intrusive iron jewellery lava macro mineral natural nature object ore page pattern paving plutonic prev1 rail railway raw rhyolite rock rough sample scientific shortened sleepers soil solid specimen stone stones stonewall terrain texture used volcanic volcanics volcano wall white wood |
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| The paving stones are used to attach the rail to the rail sleepers. Volcanic rock is a rock formed from lava erupted from a volcano. |
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