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Shallow at the entry points and the ends of the fissure, Silfra descends to a maximum depth of 63 metres (207 ft) but diving to this depth is seldom done as it requires technical diving skills. To get to the main part of Silfra from the caves, divers must go down through the "toilet" headfirst which is a narrow tunnel to a depth of 16 metres.
Silfra fissure is a popular scuba and snorkeling site. The only outflow from lake Þingvallavatn is the river Sog . One of the noted features of the lake is the presence of four morphs of the Arctic charr .
The largest of the canyons are the Noto, Cumecs, and Heron Canyons. The Noto Canyon is 27 km long, 15 km wide and 1.5 km deep, while the Cumecs Canyon is 37 km long, 39 km wide and 3 km. Both are within the northern part of the escarpment. The Heron Canyon is the largest canyon along the escarpment, being 100 km long and up to 10 km wide.
A volcanic fissure and lava channel. A fissure vent, also known as a volcanic fissure or eruption fissure, is a long volcanic vent through which lava erupts. Fissure vents are connected to deep magma reservoirs and are typically found in and along rifts and rift zones. [14] They are commonly associated with shield volcanoes.
A fissure vent, also known as a volcanic fissure, eruption fissure or simply a fissure, is a linear volcanic vent through which lava erupts, usually without any explosive activity. The vent is often a few metres wide and may be many kilometres long. Fissure vents can cause large flood basalts which run first in lava channels and later in lava ...
A fracture will sometimes form a deep fissure or crevice in the rock. Fractures are commonly caused by stress exceeding the rock strength, causing the rock to lose cohesion along its weakest plane. [1] Fractures can provide permeability for fluid movement, such as water or hydrocarbons.
Some of the rifts are full of clear water. One, Nikulásargjá [ˈnɪːkʏˌlauːsarˌcauː] , was bridged for the occasion of the visit of King Frederik VIII of Denmark in 1907. On this occasion, visitors began to throw coins from the bridge into the fissure, a tradition based on European legends.
Slate displaying fissility. In geology, fissility is the ability or tendency of a rock to split along flat planes of weakness (“parting surfaces”). [1] These planes of weakness are oriented parallel to stratification in sedimentary rocks. [2]