Volcanic Rock chart
... Aphanitic textures characterize volcanic rocks that have cooled rapidly but nonetheless have allowed for mineral crystals to form. However, the individual crystals are too small to be seen or identified with the naked eye. These can be differentiated from glassy textures by the fact that they are fa ...
... Aphanitic textures characterize volcanic rocks that have cooled rapidly but nonetheless have allowed for mineral crystals to form. However, the individual crystals are too small to be seen or identified with the naked eye. These can be differentiated from glassy textures by the fact that they are fa ...
PPT
... on two criteria: 1) the chemical composition of the magma (mafic to felsic) and 2) the environment of magma emplacement (plutonic or intrusive vs. volcanic or extrusive) ...
... on two criteria: 1) the chemical composition of the magma (mafic to felsic) and 2) the environment of magma emplacement (plutonic or intrusive vs. volcanic or extrusive) ...
Volcanoes
... • Which volcano is the oldest? • A seamount is a submarine volcanic mountain. Would you expect older volcanoes to be seamounts or islands? Explain your answer. • Which island signifies a change in direction of the movement of the Pacific Plate? • In which direction has the Pacific Plate been moving ...
... • Which volcano is the oldest? • A seamount is a submarine volcanic mountain. Would you expect older volcanoes to be seamounts or islands? Explain your answer. • Which island signifies a change in direction of the movement of the Pacific Plate? • In which direction has the Pacific Plate been moving ...
Tectonic Movement
... Plateau and shield volcanoes such as Mauna Loa Hawaii. Volcanic activity dominates the Ring of Fire located around the Pacific Ocean. Some volcanic islands have formed in this area as a result of hot spots, points along the sea floor where a thermal plume is present and forces its way through a faul ...
... Plateau and shield volcanoes such as Mauna Loa Hawaii. Volcanic activity dominates the Ring of Fire located around the Pacific Ocean. Some volcanic islands have formed in this area as a result of hot spots, points along the sea floor where a thermal plume is present and forces its way through a faul ...
San Francisco Volcanic Field
... Arizona's Hotspot • Most hotspot volcanoes are basaltic because they erupt through oceanic lithosphere (e.g., Hawaii, Tahiti). As a result, they are less explosive than subduction zone volcanoes, in which water is trapped under the overriding plate. • Where hotspots occur under continental crust, b ...
... Arizona's Hotspot • Most hotspot volcanoes are basaltic because they erupt through oceanic lithosphere (e.g., Hawaii, Tahiti). As a result, they are less explosive than subduction zone volcanoes, in which water is trapped under the overriding plate. • Where hotspots occur under continental crust, b ...
geology of napa valley - Fish Friendly Farming
... thick, massive plates come into contact they either slip over one another or smash head on creating massive heaps of mountains In creating massive heaps of mountains. In California the Pacific Plate subducted or slipped beneath the North American Plate. The rocks were smashed, ground and push ...
... thick, massive plates come into contact they either slip over one another or smash head on creating massive heaps of mountains In creating massive heaps of mountains. In California the Pacific Plate subducted or slipped beneath the North American Plate. The rocks were smashed, ground and push ...
tectonics, volcanism and seismicity: issues of paragenetic relation
... radial fractures forming a system of narrow step-like grabens up to 5-10 km wide with displacement amplitudes from 40 to 200 m. Seismic and non-seismic fractures are usually distinguished within the structure boundary. Seismic ones are usually magma-conducting. A line of fractures with northeastern ...
... radial fractures forming a system of narrow step-like grabens up to 5-10 km wide with displacement amplitudes from 40 to 200 m. Seismic and non-seismic fractures are usually distinguished within the structure boundary. Seismic ones are usually magma-conducting. A line of fractures with northeastern ...
volcanoes-natural-processes
... • The oceanic crust is younger, thinner (less than 10km) heavier (mainly basalt), can sink (be subducted) into the mantle and is constantly being destroyed and replaced. • These differences account for the variations in the level of both volcanic and earthquake activity at plate boundaries, and the ...
... • The oceanic crust is younger, thinner (less than 10km) heavier (mainly basalt), can sink (be subducted) into the mantle and is constantly being destroyed and replaced. • These differences account for the variations in the level of both volcanic and earthquake activity at plate boundaries, and the ...
Chapter Questions
... MAFIC – igneous rocks whose composition is low in Si and high in Fe, Mg, and Ca – usually found in oceanic volcanic settings like seafloor spreading centers and ocean hotspots. Example: Basalt. FELSIC – igneous rocks whose composition is high in Si and low in Fe, Mg, and Ca – usually found in contin ...
... MAFIC – igneous rocks whose composition is low in Si and high in Fe, Mg, and Ca – usually found in oceanic volcanic settings like seafloor spreading centers and ocean hotspots. Example: Basalt. FELSIC – igneous rocks whose composition is high in Si and low in Fe, Mg, and Ca – usually found in contin ...
Coso Volcanic Field - Classes Dma Ucla Edu
... solidification of magma or lava. Igneous rock may form with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. This magma can be derived from partial melts of existing rocks in either a planet’s mantle or crust. Typical ...
... solidification of magma or lava. Igneous rock may form with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. This magma can be derived from partial melts of existing rocks in either a planet’s mantle or crust. Typical ...
Microsoft Word Viewer - TestStudyGuidech10
... Which type of intrusive feature forms when magma is injected into fractures cutting across preexisting rock layers? ...
... Which type of intrusive feature forms when magma is injected into fractures cutting across preexisting rock layers? ...
Ch. 5 Volcanoes Study Guide
... 13. Describe the sizes of volcanic ash, volcanic cinders, and volcanic bombs. ...
... 13. Describe the sizes of volcanic ash, volcanic cinders, and volcanic bombs. ...
The crust is the outermost of several onion
... only about 30 to 60 km thick beneath continents and about 5 to 8 km thick beneath the oceans. The crust and a portion of the next layer, the 'mantle', forms a relatively rigid shell which has been called the 'lithosphere'. This shell is broken into fragments called tectonic plates, and the continent ...
... only about 30 to 60 km thick beneath continents and about 5 to 8 km thick beneath the oceans. The crust and a portion of the next layer, the 'mantle', forms a relatively rigid shell which has been called the 'lithosphere'. This shell is broken into fragments called tectonic plates, and the continent ...
Where Are Active Volcanoes?
... 3. Which volcanoes occur at subduction boundaries? at diverging plate boundaries? at hot spots? 4. From the information you have on your lab sheet, describe where you see the most volcanic activity. For example, is volcanic activity more prevalent at a particular longitude? 5. Of the volcanoes liste ...
... 3. Which volcanoes occur at subduction boundaries? at diverging plate boundaries? at hot spots? 4. From the information you have on your lab sheet, describe where you see the most volcanic activity. For example, is volcanic activity more prevalent at a particular longitude? 5. Of the volcanoes liste ...
“Mediterranean volcanoes vs. chain volcanoes in the Carpathians”
... is located in Aegean Sea – Greece. Between Sicily and Tunisia there are 13 underwater volcanoes. The island called Vulcano, it has an active volcano, and it is the origin of the word. Every volcano in the world is named after this island, just north of Sicily. Vulcano is the southernmost of the 7 ma ...
... is located in Aegean Sea – Greece. Between Sicily and Tunisia there are 13 underwater volcanoes. The island called Vulcano, it has an active volcano, and it is the origin of the word. Every volcano in the world is named after this island, just north of Sicily. Vulcano is the southernmost of the 7 ma ...
Spatial Scale of the Cascade Volcanic Arc as a result of Magma
... axis of the Cascade Range. Its topography is an example of how mafic-rich lavas with low-viscosity shape the landscape. This is mainly a shield volcano that consists of small, cinder cones and low-sloping lava basaltic to basaltic-andesite flows that expand over a map area of about 2000 km2. The tot ...
... axis of the Cascade Range. Its topography is an example of how mafic-rich lavas with low-viscosity shape the landscape. This is mainly a shield volcano that consists of small, cinder cones and low-sloping lava basaltic to basaltic-andesite flows that expand over a map area of about 2000 km2. The tot ...
PowerPoint bemutató
... surfaces. The properties of the ash depend mostly on the relative proportions of their main constituents. ...
... surfaces. The properties of the ash depend mostly on the relative proportions of their main constituents. ...
Northern Cordilleran Volcanic Province
The Northern Cordilleran Volcanic Province (NCVP), formerly known as the Stikine Volcanic Belt, is a geologic province defined by the occurrence of Miocene to Holocene volcanoes in the Pacific Northwest of North America. This belt of volcanoes extends roughly north-northwest from northwestern British Columbia and the Alaska Panhandle through Yukon to the Southeast Fairbanks Census Area of far eastern Alaska, in a corridor hundreds of kilometres wide. It is the most recently defined volcanic province in the Western Cordillera. It has formed due to extensional cracking of the North American continent—similar to other on-land extensional volcanic zones, including the Basin and Range Province and the East African Rift. Although taking its name from the Western Cordillera, this term is a geologic grouping rather than a geographic one. The southmost part of the NCVP has more, and larger, volcanoes than does the rest of the NCVP; further north it is less clearly delineated, describing a large arch that sways westward through central Yukon.At least four large volcanoes are grouped with the Northern Cordilleran Volcanic Province, including Hoodoo Mountain in the Boundary Ranges, the Mount Edziza volcanic complex on the Tahltan Highland, and Level Mountain and Heart Peaks on the Nahlin Plateau. These four volcanoes have volumes of more than 15 km3 (3.6 cu mi), the largest and oldest which is Level Mountain with an area of 1,800 km2 (690 sq mi) and a volume of more than 860 km3 (210 cu mi). Apart from the large volcanoes, several smaller volcanoes exist throughout the Northern Cordilleran Volcanic Province, including cinder cones which are widespread throughout the volcanic zone. Most of these small cones have been sites of only one volcanic eruption; this is in contrast to the larger volcanoes throughout the volcanic zone, which have had more than one volcanic eruption throughout their history.The Northern Cordilleran Volcanic Province is part of an area of intensive earthquake and volcanic activity around the Pacific Ocean called the Pacific Ring of Fire. However, the Northern Cordilleran Volcanic Province is commonly interpreted to be part of a gap in the Pacific Ring of Fire between the Cascade Volcanic Arc further south and the Aleutian Arc further north. But the Northern Cordilleran Volcanic Province is recognized to include over 100 independent volcanoes that have been active in the past 1.8 million years. At least three of them have erupted in the past 360 years, making it the most active volcanic area in Canada. Nevertheless, the dispersed population within the volcanic zone has witnessed few eruptions due to remoteness and the infrequent volcanic activity.