crevasses, rockface, boulder, ledge, canyon, cavern, scree, abysses, snowfield, creek bed, mousehole, posthole, seracs, indention, burrow, ravine, serac, piton, nook, crampon, crags, cave, cranny, doorway, cavelike, cavity, gulch, tree trunk, blackberry bush, drainpipe, mountainside, puddle, manhole, pebble, trench, ant hill, slickrock, popple, shaft, mud puddle, hemlock tree, chasms, indentations, streambed, snowshed, spelunk, crawlspace, couloir, stalactites, chest cavity, icefall, creek, rocks, passageways, hummocks, chainlink fence, mineshaft, underneath, daddy longlegs, floor joist, anthills, juniper bush, hillside, hole, crater, keyhole, pores, bivvy, nutshells, gully, handhold, rock outcrop, gorge, stairwell, slit trench, timberline, spatterdock, encasement, deadfall, floorboard, precipices, tree stump, sleeping bag, cenote, groundsheet, bramble bush, soakaway, nuptse, window sill, ridges, doorframe, slab, volcanic crater, awl, belays, sinkhole, spelunkers, bushes, pencil eraser, rafter, spathe, hut, crevices, gullies, hollow, hollows, ravines, crevasse, ledges, crack, loophole, beach, canyons, abrasive, adhering, aeolian, aerosolized, agglomerated, agglutinated, airborne, allergenic, anodic, anvil, asbestos, ashy, asteroidal, atmospheric, azurophilic, balsa, bibliographic, bimetallic, biogenic, bituminous

break, chap, chink, crater, crevasse, fatigue crack, fault, fault line, fracture, geological fault, rift, slit, split, vent, volcano

cranny

depression, gap, impression, imprint, opening

chap, cleft, crack, cranny, fissure, scissure