behold the beauty of underground cave on yourandroid screen. a cave or cavern is a natural underground spacelarge enough for a human to enter. caves form naturally by theweathering of rock and often extend deep underground. get thisscary wallpapers and dark wallpapers now. the word cave can alsorefer to much smaller openings such as sea caves, rock shelters andgrottos. reed flute. speleology is the science of exploration andstudy of all aspects of caves and the environment that surroundsthe caves. exploring a cave for recreation or science may be calledcaving, potholing, or spelunking. some cave story, mammoth cave andman cave can be found inside it. the formation and development ofcaves is known as speleogenesis. caves are formed by variousgeologic processes and can be variable sizes. these may involve acombination of chemical processes, erosion from water, tectonicforces, microorganisms, pressure, and atmospheric influences.allegory of the cave, compass. for karst caves the maximum depth isdetermined on the basis of the lower limit of karst formingprocesses, coinciding with the base sequences limestone, which maybe lower than the erosion base due to the presence of siphonchannels.
most caves are formed in limestone by dissolution. a veil ofdarkness cloaks the natural beauty of caves. some are found incliffs at the edge of the coastline, chipped away by the relentlesspounding of waves. others form where a lava tube’s outer surfacecools and hardens and the inside of the molten rock drains away.caves even form in glaciers where meltwater carves tunnels at thebeginning of its journey to the sea. but most caves form in karst,a type of landscape made of limestone, dolomite, and gypsum rocksthat slowly dissolve in the presence of water with a slightlyacidic tinge. rain mixes with carbon dioxide in the atmosphere asit falls to the ground and then picks up more of the gas as itseeps into the soil. retina wallpapers. the combination is a weakacidic solution that dissolves calcite, the main mineral of karstrocks. the acidic water percolates down into the earth throughcracks and fractures and creates a network of passages like anunderground plumbing system. the passages widen as more water seepsdown, allowing even more water to flow through them. eventually,some of the passages become large enough to earn the distinction ofultimate cave. most of these solutional caves require more than100,000 years to widen large enough to hold a human.
hd graphic 720p
Uploaded January 15, 2018 05:25