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A lava tube, or pyroduct, [1] is a natural conduit formed by flowing lava from a volcanic vent that moves beneath the hardened surface of a lava flow.
The Barrier is a lava dam retaining the Garibaldi Lake system in southwestern British Columbia, Canada. It is over 300 m (980 ft) thick and about 2.4 km (1.5 mi) long where it impounds the lake. [1] The area below and adjacent to The Barrier is considered hazardous due to the unstable lava formation. [2]
Some lava flows hold a mixture of multilevel and multilateral tubes. One other form a lava tube can take is the tube-in-tube which can form inside lava tubes if the linings of the walls are weak enough to lean inward, forming a new floor above the old. Tube-in-tubes are generally noted to form during the last lava draining through the main lava ...
Túnel de la Atlántida (English: Tunnel of Atlantis) is the world's longest known volcanic submarine lava tube located in the Canary Islands off the coast of North Africa. It is the underwater portion of the Cueva de los Verdes lava tube at Haría, Las Palmas .
Pillow lava on the ocean floor of Hawaii. Pillow lavas are lavas that contain characteristic pillow-shaped structures that are attributed to the extrusion of the lava underwater, or subaqueous extrusion. Pillow lavas in volcanic rock are characterized by thick sequences of discontinuous pillow-shaped masses, commonly up to one meter in diameter.
Effusive eruptions involve a relatively gentle, steady outpouring of lava rather than large explosions. They can continue for years or decades, producing extensive fluid mafic lava flows. [43] For example, Kīlauea on Hawaiʻi continuously erupted from 1983 to 2018, producing 2.7 km 3 (1 cu mi) of lava covering more than 100 km 2 (40 sq mi). [44]