| Just to the west of Mount Schank, an extinct volcano created a series of deep sinkholes, which harbour some unusual life forms. |
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| Even sinkholes similar to the one last summer have been around since the 18th Century. |
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| Karst is an area of irregular limestone in which erosion has produced fissures, sinkholes, underground streams, and caverns. |
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| This is the process by which rainwater erodes limestone cliffs and creates limestone caves and sinkholes. |
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| The trip passes by waterfalls, forests, canyons, valleys, sinkholes and caves. |
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| The enclosed depressions are complex forms of dolines or sinkholes, which act as centripetal drainage basins. |
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| Subsidence sinkholes are diagnostic landforms of karst, which form in unconsolidated soils or drift deposits overlying cavernous limestone. |
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| Collapsed sinkholes generally have steep rock sides and may receive streams that then flow underground. |
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| The only apparent source of recharge is rainfall collecting in sinkholes, or indents in the topography, according to recent satellite images. |
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| Go caving in the magical underground caves at Kelly Hill Conservation Park, squeezing through the sinkholes and caverns. |
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| No longer is there a bottomless pit of dollars to salvage and subsidize sinkholes like VIA Rail. |
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| They were marching steadily across the marshy northlands, their pace slowed by the necessity of watching their feet for sinkholes and mud puddles. |
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| East of Adana, much of the coastal plain has limestone features such as collapsed caverns and sinkholes. |
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| It also keeps an up-to-date National Karst Database recording visible sinkholes, springs, soakaways and known building damage. |
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| After you cross the myth-filled Gorjanci mountain range, a land of white birches, swaying ferns and sinkholes opens before you. |
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| The clay is thicker in some locations, making them even more prone to sinkholes. |
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| Non-naturally occurring sinkholes can form because of water main breaks, sewer collapses, or even abandoned mines. |
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| Salt karst sinkholes, caverns, and crevices may be formed depending on the thickness of the salt body. |
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| Karstic sinkholes and poljes are famous for having terra rossa, a red soil produced by the degradation of the underlying limestone. |
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| In addition, the floors of the valleys may be dissected into a sequence of sinkholes. |
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| Stream banks collapse, channels become overgrown with vegetation, and shallow sinkholes begin to form in the valley floor. |
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| Abandoned mines are sometimes safety hazards, continuing sources of pollution or the cause of dangerous sinkholes. |
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| Springs, sinkholes, and caves are just a few examples of the types of karst features commonly found in the limestone and dolomite geology of this region. |
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| During dry spells all water sinks very quickly on reaching the limestone, through sinkholes. |
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| Petitcodiac has a rare honeycombed karst occurrence west of town, where sinkholes the size of a small car tire alternate with ridges just wide enough for a footstep. |
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| Potential sinkholes can be detected by radar, seismography and electrical resistivity testing. |
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| This patented preparation is a natural product based on trace elements composed and mixed to destroy miasmas and sediments in sinkholes and in septic tanks. |
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| He finds caves by scouting out sinkholes scattered throughout the region. |
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| In the middle of the swamp, the sinkholes are filled with as much as seven feet of standing water, and the air has the slack, drapey weight of wet velvet. |
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| The landscape is of the type known as karst, in which the limestone rocks are honeycombed with tunnels and openings so that much of the drainage runs underground, and deep sinkholes abound. |
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| Karst areas are very fragile landscapes underlain by limestone eroded by dissolution, producing ridges, towers, fissures, sinkholes, and other characteristic landforms that need careful management to sustain local economies. |
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| The route we are proposing cross some interesting sinkholes, linking up and down through a fascinating labyrinth sector and is ideal for making observations on the vegetation, geology, erosion formations and wildlife. |
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| Before the meeting at the summit for the huge bivouac in the evening of the first stage, it is about finding one's way in this universe sculptured by limestone through sinkholes, lapiaz, hollows and bumps. |
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| It is characterized by underground drainage systems with sinkholes and caves. |
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| These cavities frequently collapse to form sinkholes that form part of the local karst topography. |
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| Many live underground in marine and freshwater caves, sinkholes, or stream beds. |
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| Extended systems of underwater caves, sinkholes and springs are found throughout the state and supply most of the water used by residents. |
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| The thousands of sinkholes known as cenotes throughout the region provide access to the groundwater system. |
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| We need to determine the exact deepness of the sinkhole, its diameter, and if there are other sinkholes nearby, Llamedo commented. |
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| Most homeowners policies exclude coverage for sinkholes, and it's difficult to find an insurance company that offers the coverage even on an optional basis. |
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| It contains an unusual type of ecosystem characterized by algific talus, a loose-rock slope affected by the movement of cold air produced by sinkholes and ice. |
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| The newer formations are the drumlins and glacial valleys as a result of the last ice age, and the sinkholes and cave formations in the limestone regions of Clare. |
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| It is the latest in a spate of sinkholes to open up across the UK in the last couple of years, including one 20ft deep hole which opened up in nearby Watford last year. |
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| Heavy rainfall, snowmelt, or high levels of ground water may trigger a movement of soil or sediments, possibly causing mudslides, landslides, avalanches, or sinkholes. |
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| Sinkholes have often been used as farmstead or community trash dumps. |
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| Sinkholes can develop gradually as surface openings enlarge, but progressive erosion is frequently unseen until the roof of an underground cavern suddenly collapses. |
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| Sinkholes are caused as a result of erosion, often from heavy rainfall. |
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| Sinkholes and other subsurface voids were the object of inquiry in. |
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| Sinkholes are pits in the ground formed when water fails to drain away. |
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