particles that can originate by (1) weathering and erosion of preexisting rocks, (2) chemical precipitation from solution, usually in water, and (3) secretion by organisms.sedimentary environmentsedimentaeni prostoediArea with specific conditions for deposition which are approximatelly the same on every place within the area.sedimentary rockszepvnine usazene horninyRock that has formed from (1) lithification of any type of sediment, (2) precipitation from solutionsedimentationsedimentaceSee deposition.seismic wavesseismicke vlnyA wave of energy produced by an earthquake.seismogramseismogramPaper record of earth vibration.seismographseismografA seismometer with a recording device that produces a permanent record of earth motion.sericitesericitVery fine-grained variety of muscovite. Mineral grains are usually not visible. The presence of sericite in a rock can be easily identified by typical silk luster. It is mineral typical for metamorphic rocks. Properties see micas.serpentineserpentinMineral typical for metamorphic rocks. Very dark green to black in colour, hardness varies from 3 to 5. Luster is dull to greasy, slight greasy feel. It forms very fine-grained (macroscopically massive) accumulations.serpentiniteserpentinitType of metamorphic rock composed mostly of mineral serpentine. It is usually dark green to green-black in colour, massive and macroscopically dense. Joints of this rock are usually filled with chrysotile (asbestos).shaleboidliceA fine-grained sedimentary rock (grains finer than 0.06 mm in diameter) formed by the cementation of silt and clay (mud). Shale has thin layers (laminations) and an ability to split (fissility) into small chips.shear forceThe component of gravitational force that is parallel to an inclined surface.shear strengthsmykova pevnostThe resistance to movement or deformation of material.shear stresssmykove napitiStress due to forces that tend to cause movement or strain parallel to the direction of the forces.sheet jointsCracks that develop parallel to the outer surface of a large mass of expanding rock, as pressure is released during unloading.shelfselfZone of sea bottom along all continents with varying width and dip 0.1%. It is bordered from one side by continental slope and from other side by continent.shock metamorphismsokova metamorfozaThe fastest type of metamorphism affecting surrounding rocks usually in tenths of second.shrinkingsmrs?ovaniDecreasing of mineral and rock volumes caused by lowering of moisture.schistkrystalicka boidliceA metamorphic rock characterized by coarse-grained minerals oriented approximatelly parallel.silicaoxid koemieityA term used for oxygen plus silicon.silicatesilikatyA substance that contains silica as part of its chemical formula.silllo?ni ?ilaA tabular intrusive structure concordant with the country rock.sillimanitesilimanitMineral typical for metamorphic rocks. White, pale green or brown in colour, hardness varies from 6 to 7. It forms long, slender crystals, commonly as groups of parallel crystals.siltprachSediment composed of particles with a diameter of 0.002 mm to 0.06 mm.siltstoneprachovecA sedimentary rock consisting mostly of silt grains.SiluriansilurGeological period of Paleozoic between 408 ad 438 mil. of years ago.sinkholezavrtA closed depresion found on land surfaces underlain by limestone.sintersintrA deposit of silica that forms around some hot springs and geysers.slateboidliceA fine-grained rock that splits easily along flat, parallel planes.slidesesuvIn mass wasting, movement of a descending mass along a plane approximatelly parallel to the slope of the surface (see landslide).slipsesuvIn mass wasting, movement of a descending mass along one or more well-defined surfaces (see landslide).slope angleuhel sklonu svahuDip angle of a slope.slumpsesuvIn mass wasting, movement along a curved surface in which the upper part moves vertically downward while