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2. Silfra - Wikipedia

   en.wikipedia.org/wiki/Silfra

   Silfra fissure The Mid-Atlantic Ridge passing through Þingvellir Rocks and boulders that have piled up in the fissure due to earthquakes.. Silfra (Icelandic pronunciation: [ˈsɪl(v)ra]) is a rift formed in the Mid-Atlantic Ridge – the divergent tectonic boundary between the North American and Eurasian plates – and is located in the Þingvallavatn Lake in the Þingvellir National Park in ...

3. National Register of Historic Places listings in Columbus, Ohio

   en.wikipedia.org/wiki/National_Register_of...

   This is a list of the National Register of Historic Places entries in Columbus, Ohio, United States.The National Register is a federal register for buildings, structures, and sites of historic significance.

4. Þingvellir - Wikipedia

   en.wikipedia.org/wiki/Þingvellir

   There is an information centre near the camping grounds. [19] There are hiking trails, such as the Execution Trail [20] and the nearby Leggjabrjótur [ˈlɛcːaˌprjouːtʏr̥]. Scuba diving has also become popular at Silfra Lake as the continental drift between the tectonic plates made it wide enough for divers to enjoy unparalleled visibility.

5. Alum Creek Lake - Wikipedia

   en.wikipedia.org/wiki/Alum_Creek_Lake

   The spillway is located high on the right abutment with the raceway dropping off in front of it to the stilling basin below. Control is provided by three 34 ft (10 m) by 25 ft (7.6 m) tainter gates supported by 8 ft (2.4 m) wide concrete piers resting on concrete ogee sections. The ogee sections have a crest elevation of 878 feet (268 m) and ...

6. Concrete degradation - Wikipedia

   en.wikipedia.org/wiki/Concrete_degradation

   The formation of fissures in the concrete cover above the reinforcement bars represents a preferential pathway for the ingress of water and aggressive agents such as CO 2 (lowering of pH around the rebar) and chloride anions (pitting corrosion) into concrete. The physical formation of cracks therefore favors the chemical degradation of concrete ...

7. Permeable paving - Wikipedia

   en.wikipedia.org/wiki/Permeable_paving

   Permeable pavement surfaces may be composed of; pervious concrete, porous asphalt, paving stones, or interlocking pavers. [1] Unlike traditional impervious paving materials such as concrete and asphalt, permeable paving systems allow stormwater to percolate and infiltrate through the pavement and into the aggregate layers and/or soil below. In ...

8. Ohio Caverns - Wikipedia

   en.wikipedia.org/wiki/Ohio_Caverns

   Ohio Caverns is a show cave located 30 miles (48 km) from Dayton, Ohio near West Liberty, in Salem Township, Champaign County, Ohio in the United States.A popular tourist destination and member of the National Caving Association, it is the largest of all the cave systems in Ohio and contains many crystal formations.

9. Pervious concrete - Wikipedia

   en.wikipedia.org/wiki/Pervious_concrete

   A pervious concrete street in 2005. Pervious concrete (also called porous concrete, permeable concrete, no fines concrete and porous pavement) is a special type of concrete with a high porosity used for concrete flatwork applications that allows water from precipitation and other sources to pass directly through, thereby reducing the runoff from a site and allowing groundwater recharge.