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Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...
Volcanoes vary greatly in their level of activity, with individual volcanic systems having an eruption recurrence ranging from several times a year to once in tens of thousands of years. [76] Volcanoes are informally described as erupting, active, dormant, or extinct, but the definitions of these terms are not entirely uniform among ...
Pyroclastic shield – Shield volcano formed mostly of pyroclastic and highly explosive eruptions; Resurgent dome – Volcanic landform; Seamount – Mountain rising from the ocean seafloor that does not reach to the water's surface; Shield volcano – Low-profile volcano usually formed almost entirely of fluid lava flows
Also amphidrome and tidal node. A geographical location where there is little or no tide, i.e. where the tidal amplitude is zero or nearly zero because the height of sea level does not change appreciably over time (meaning there is no high tide or low tide), and around which a tidal crest circulates once per tidal period (approximately every 12 hours). Tidal amplitude increases, though not ...
The word can be analysed as follows: Pneumono: from ancient Greek (πνεύμων, pneúmōn) which means lungs; ultra: from Latin, meaning beyond; micro and scopic: from ancient Greek, meaning small looking, referring to the fineness of particulates; silico-: from Latin, silicon; volcano: from Latin, referring to volcano
List of volcanoes in Eritrea; List of volcanoes in Ethiopia; List of volcanoes in Kenya; List of volcanoes in Libya; List of volcanoes in Madagascar; List of volcanoes of Mauritius; In Nigeria all the volcanoes are in the Biu Plateau; List of volcanoes in Réunion; List of volcanoes in Rwanda; São Tomé and Príncipe has only one volcano, Pico ...
The dashed trajectories are the result of lava pieces with a bright hot side and a cool dark side rotating in mid-air. Volcanology (also spelled vulcanology) is the study of volcanoes, lava, magma and related geological, geophysical and geochemical phenomena . The term volcanology is derived from the Latin word vulcan.
World map of active volcanoes and plate boundaries Kīlauea's lava entering the sea Lava flows at Holuhraun, Iceland, September 2014. An active volcano is a volcano that has erupted during the Holocene (the current geologic epoch that began approximately 11,700 years ago), is currently erupting, or has the potential to erupt in the future. [1]