igneous rock

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Related to Acidic Rock: Acid rock drainage
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Acidic rock cliffs and ledges (usually composed of sandstone) in shady, dry-mesic environments; Cumberland Plateau, Ridge and Valley, upper Piedmont; infrequent.
Areas riddled with pockets of pyrite, a highly acidic rock that would be dangerous to trout in the Ocoee River, were identified through geophysical surveying and drilling.
Major element analysis finds out that Tobra Formation sandstone are lithic-arenite and non-marine deposits with increasing maturity and subalkaline, basic to acidic rocks.
It is thought the farm is crawling with spiders because of its unique geography: it partly overlays limestone as well as the more typical, acidic rocks of upland Wales, increasing the number of spiderfriendly vegetation types.
brasiliensis is a rare species; it grows on crevices and hollows of acidic rocks, at 2000 m or more, where the lycophyte Huperzia saururus (Lam.) Trevis.