volcanic rock dominates the earth's surface.
what type of rock dominates the earth's surface?
volcanic
erh has been used for over 15 years for treatment of unconsolidated soils in both the vadose and saturated zones. recent advancements and results show that erh can be an effective treatment method for bedrock. at an erh site, the primary electrical current path is on the thin layer of water immediately adjacent to the soil or rock grains. little current is carried by the water in the pore volume. it is not the pore fluid that dominates the electrical conductivity; it is the grain wetting fluid that dominates the electrical conductivity. sedimentary rock will typically possess the thin layer of water required for current flow. this means erh can effectively be used for treatment of sedimentary bedrock, which typically has significant primary porosity.
electrical resistance heating
the rocky volcanic outcrop of cave rock dominates the beach. until the mid-1860s, the feature was known as cass rock, after the surveyor thomas cass. there are other rocky outcrops in the area and the volcanic nature of the geology is readily apparent from several of the exposed cliffs around the valley.





















































a sea wall and wide esplanade have been built along the length of the beach to prevent coastal erosion.





















































section::::geography.:sumner bar.
sumner, new zealand