workings.quartzkoemenMineral with the formula SiO2. In the nature it occurs in many different colours, but as a rock forming mineral it is usually light grey or grey in colour. Hardness is 7, usually forms allotriomorphic grains.They are macroscopically recognizable from feldspars by fracture planes with vitreous luster (no cleavage planes).quartz dioritekoemenny dioritPlutonic rock belonging to granitoid group, where plagioclases prevail over K-feldspars.quartzitekoemenecA quartz rock derived from sandstone, composed dominantly of quartz, and characterized by such thorough induration, either through cementation with silica or through recrystallization, that it is essentially homogeneous and breaks with vitreous surfaces that transect original grains and matrix or interstitial material with approximatelly equal ease.QuaternarykvarterThe youngest geological period; includes the present time (from 1.8 mil. of years ago to present).receding glacierustupujici ledovec (zmensujici se)A glacier with a negative budget, which causes the glacier to grow smaller as its edges melt back.Recentrecentni (soueasny)Formed in the present time.recumbent foldle?ata vrasaA fold overturned to such an extent that the limbs are essentially horizontal.regional metamorphic rocksregionalni metamorfovane horninyType of metamorphic rocks formed by the proces of regional metamorphism.regional metamorphismregionalni metamorfozaMetamorphism involving relatively high temperature and pressure which affects large areas.rechargeThe addition of new water to an aquifer or to the zone of saturation.residual rocksrezidualni horninyRemaining part of parent rock after weathering which was not transported. It is often fragmented and caving.resinous lustersmolny leskSee pitch luster.reverse faultpoesmykA fault in which the hanging-wall block moved up relative to the footwall block.rhyoliteryolitA fine-grained, felsic, volcanic igneous rock made up mostly of feldspar and quartz. Often with porous and fluidal structure.rift valleyriftove udoliA tensional valley bounded by normal faults. Rift valleys are found at diverging plate boundaries on continents and along the crest of the mid-oceanic ridge.rigid zoneUpper part of a glacier in which there is no plastic flow.Richter scaleRichterova stupniceA numerical scale of earthquake magnitudes.ripple markseeoinySmall ridges formed on sediment surfaces exposed to moving wind or water. The ridges form perpendicularly to the motion.rockhorninaRock is inhomogeneous mineral association which forms the earth's crust in a form of many separated units. Every rock is characterized by structure, texture and mineral coposition reflecting its origin.rock avalancheA very rapidly moving, turbulent mass of broken-up bedrock.rock forming mineralshorninotvorne mineralyGroup of minerals that form greatest part of rock volume.rock strengthpevnost horninyAbility of rock to resist to surrounding pressure.rockfallskalni oiceniRock falling freely or bouncing down a cliff.roundingzaobleniThe grinding away of sharp edges and corners of rock fragments during transportation.rupturekoehka deformaceBrittle deformation of rock.S-wavesS-vlnyA seismic waves propagated by a shearing motion, which causes rock to vibrate perpendicular to the direction of wave propagation.sandpisekSediment composed of particles with a diameter between 2 mm and 0.06 mm.sand dunepiseene dunyA mound of loose sand grains heaped up by the wind.sandstonepiskovecA medium-grained sedimentary rock (grains between 2 mm and 0.06 mm) formed by the cementation of sand grains (mainly quartz).saturated zonenasycena zonaA subsurface zone in which all rock openings are filled with water.scaled shapesupinkovitySheet-like mineral shape (e.g. micas).sea-floor spreadingThe concept that the ocean floor is moving away from the mid-oceanic ridge and across the deep ocean basin, to disappear beneath continents and island arcs.sedimentnezpevnina usazena horninaLoose, solid