What type of lava is basaltic?
Basaltic lava is another term for mafic lava. Mafic lava is molten rock that is enriched in iron and magnesium and low in silica. When mafic lava cools on the earth's surface, it forms basalt, which is why mafic lava is commonly called 'basaltic lava.
What does basaltic lava look like?
Basalt is erupted at temperatures between 1100 to 1250 ° C. Volcanic rock (or lava) that characteristically is dark in color (gray to black), contains 45 to 53 percent silica, and is rich in iron and magnesium. Basaltic lavas are more fluid than andesites or dacites, which contain more silica.
What is the main type of eruption that formed the volcano in this photograph quizlet?
What type of eruption formed the volcano in this image? The type of volcanic eruption shown in this photograph is: a pyroclastic column.
What are the types of basaltic magma?
Viscosity of Magmas
| Summary Table | ||
|---|---|---|
| Magma Type | Solidified Rock | Chemical Composition |
| Basaltic | Basalt | 45-55 SiO2 %, high in Fe, Mg, Ca, low in K, Na |
| Andesitic | Andesite | 55-65 SiO2 %, intermediate in Fe, Mg, Ca, Na, K |
| Rhyolitic | Rhyolite | 65-75 SiO2 %, low in Fe, Mg, Ca, high in K, Na. |
Sep 14, 2015
What is basaltic volcano?
Basaltic volcanoes are characterized by persistent periods of activity ranging from effusive lava flows to explosive eruptions with variable intensity (i.e., lava fountains to high-intensity, short-lasting paroxysmal events), each posing different types of potential threats to the local population.
How do you identify basalt?
0:071:15Identifying Basalt – YouTubeYouTube
What does basalt look like?
Basalt is usually dark grey to black in colour, due to its high content of augite or other dark-coloured pyroxene minerals, but can exhibit a wide range of shading. Some basalts are quite light-coloured due to a high content of plagioclase, and these are sometimes described as leucobasalts.
What evidence is shown on this photograph that suggests the slumgullion landslide has not or is not moving rapidly?
What evidence is shown on this photograph that suggests the Slumgullion landslide has not or is not moving rapidly? Trees are growing on the landslide material.
What is a hazard connected with basaltic lava flows and eruptions?
Hazards associated with basaltic lava flows and eruptions are: –burial of roads and neighborhoods by lava flows. -house fires. -Volcanic gases and methane explosions. A volcano has a Plinian eruption with an eruption column 9 kilometers high.
Where can you find basaltic magma?
Basaltic magma is formed through dry partial melting of the mantle. The mantle lies just below the crust of the earth. Basalts make up most of the ocean's crust; this is why basaltic magma is typically found in oceanic volcanoes.
What are basalt characteristics?
Basalt is rich in iron and magnesium and is mainly composed of olivine, pyroxene, and plagioclase. Most specimens are compact, fine-grained, and glassy. They can also be porphyritic, with phenocrysts of olivine, augite, or plagioclase. Holes left by gas bubbles can give basalt a coarsely porous texture.
What texture is basalt?
Basalts have almost always aphanitic or fine-grained mineral texture resulting from rapid cooling of volcanic magma.
What kind of rock is basalt?
volcanic rock Basalt is a hard, black volcanic rock. Basalt is the most common rock type in the Earth's crust. Depending on how it is erupted, basalt can be hard and massive (Figure 1) or crumbly and full of bubbles (Figure 2).
What likely caused much of the damage shown in this photograph in the 1906?
What likely caused much of the damage shown in this photograph in the 1906 San Francisco earthquake? They compress and then expand the rock in the direction the wave travels.
Which of the following best describes the relationship between rate of movement in the slumgullion landslide and precipitation multiple choice question?
___ cause 25 to 50 annual fatalities in the United States. (Use just one word.) Which of the following best describes the relationship between rate of movement in the Slumgullion landslide and precipitation? The failure moves more slowly in drier periods.
What are basaltic eruptions?
Basaltic eruptions are the most common form of volcanism on Earth and planetary bodies. The low viscosity of basaltic magmas inhibits fragmentation, which favours effusive and lava-fountaining activity, yet highly explosive, hazardous basaltic eruptions occur.
What are the materials that come out of an erupting volcano are they hot if so why?
Volcanic eruptions produce three types of materials: gas, lava, and fragmented debris called tephra.
Which type of fault was responsible for the devastation associated with the 1906 earthquake in San Francisco?
Scientist project the San Andreas Fault line could cause a devastating earthquake in California by 2030. The San Andreas fault caused the biggest earthquakes in California with an approximate magnitude 7.9 in 1857 (Southern California) and 1906 (San Francisco).
What do you call the downward movement of soil rocks and earth materials along the slope?
The term "landslide" describes a wide variety of processes that result in the downward and outward movement of slope-forming materials including rock, soil, artificial fill, or a combination of these. The materials may move by falling, toppling, sliding, spreading, or flowing.
What features characterize basaltic volcanoes?
Because of the low viscosity, basaltic lava flows spread out, forming extensive layers. They may build up to form a large shield volcano — volcanos with low sloping sides. Pahoehoe and a'a lava textures are typically associated with basaltic lava flows.
What is the characteristics of basalt?
Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals. It most commonly forms as an extrusive rock, such as a lava flow, but can also form in small intrusive bodies, such as an igneous dike or a thin sill. It has a composition similar to gabbro.
Is basaltic magma viscous?
Viscosity of Magmas Thus, basaltic magmas tend to be fairly fluid (low viscosity), but their viscosity is still 10,000 to 100,0000 times more viscous than water. Rhyolitic magmas tend to have even higher viscosity, ranging between 1 million and 100 million times more viscous than water.
Which materials come out during a volcanic eruption answer?
Volcanic eruptions produce three types of materials: gas, lava, and fragmented debris called tephra.
What likely caused much of the damage shown in this photograph in the 1906 San Francisco earthquake?
What likely caused much of the damage shown in this photograph in the 1906 San Francisco earthquake? They compress and then expand the rock in the direction the wave travels.
What type of earthquake was the San Francisco 1906?
Strike-slip 1906 San Francisco earthquake
| Ruins in the vicinity of Post and Grant Avenue | |
|---|---|
| Eureka Dunsmuir Chico Truckee Santa Rosa Salinas Bakersfield Fresno Paso Robles Santa Monica Indio | |
| Fault | San Andreas Fault |
| Type | Strike-slip |
| Areas affected | North Coast San Francisco Bay Area Central Coast United States |
Where rotational movement of soil is accompanied by downslope movement the feature that is observed is a?
A landslide is a downslope movement of rock or soil, or both, occurring on the surface of rupture—either curved (rotational slide) or planar (translational slide) rupture—in which much of the material often moves as a coherent or semicoherent mass with little internal deformation.
How rocks and soil move down slope to the direct action of gravity during the process of mass wasting?
Mass movement is an erosional process that moves rocks and sediments downslope due to the force of gravity. The material is transported from higher elevations to lower elevations where other transporting agents like streams or glaciers can pick it up and move to even lower elevations.
What type of rock is basalt?
Basalt is a hard, black volcanic rock. Basalt is the most common rock type in the Earth's crust. Depending on how it is erupted, basalt can be hard and massive (Figure 1) or crumbly and full of bubbles (Figure 2).
What is basalt material?
Basalt fiber is a material made from extremely fine fibers of basalt, which is composed of the minerals plagioclase, pyroxene, and olivine. It is similar to fiberglass, having better physicomechanical properties than fiberglass, but being significantly cheaper than carbon fiber.
Which materials come out during a volcanic eruption in which state of matter are these materials?
Volcanic eruptions produce three types of materials: gas, lava, and fragmented debris called tephra.