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What is the difference between rhyolite and andesite?
They have different compositions. Most igneous rocks fall into a spectrum ranging from mafic (low silica, dominated by iron, magnesium, and calicum) to felsic (high silica, dominated by sodium and potassium) On this scale rhyolite is felsic while andesite is intermediate. Rhyolite is dominated by the presence of quartz, potassium feldspar, and sodium-rich plagioclase. Rhyolite also tends to contain more volcanic glass. Common colors of rhyolite are light gray, white, and pink. Andesite often contains plagioclase with a fiar balance of sodium and potassium. Plagioclase is also a common dominant mineral. Andesite is darker than rhyolite, ranging from gray to almost black.
What are some different types of lava rocks?
Some different types of lava rocks include basalt, andesite, rhyolite, and obsidian. Basalt is the most common type and is dark in color with a fine-grained texture, while andesite is similar but contains more silica. Rhyolite is light in color with a high silica content, and obsidian is a dark, glassy rock formed from rapidly cooled lava.
What is the difference between andesite and basalt?
Andesite is an intermediate volcanic rock that contains more silica and is lighter in color compared to basalt. Basalt is a fine-grained volcanic rock that is darker in color and forms from rapidly cooling lava at Earth's surface.
Which pair of minerals is most likely to be found in felsic rock?
Quartz and feldspar are the most likely pair of minerals found in felsic rock. Felsic rocks are rich in silica, which forms minerals like quartz, and feldspar is another common mineral found in these rocks.
What type of rock forms most often near an active volcano?
The most common type of rock that forms near an active volcano is igneous rock. This type of rock forms from the cooling and solidification of magma or lava. Examples include basalt, andesite, and rhyolite.
What is the difference between rhyolite and andesite?
They have different compositions. Most igneous rocks fall into a spectrum ranging from mafic (low silica, dominated by iron, magnesium, and calicum) to felsic (high silica, dominated by sodium and potassium) On this scale rhyolite is felsic while andesite is intermediate. Rhyolite is dominated by the presence of quartz, potassium feldspar, and sodium-rich plagioclase. Rhyolite also tends to contain more volcanic glass. Common colors of rhyolite are light gray, white, and pink. Andesite often contains plagioclase with a fiar balance of sodium and potassium. Plagioclase is also a common dominant mineral. Andesite is darker than rhyolite, ranging from gray to almost black.
What are some different types of lava rocks?
Some different types of lava rocks include basalt, andesite, rhyolite, and obsidian. Basalt is the most common type and is dark in color with a fine-grained texture, while andesite is similar but contains more silica. Rhyolite is light in color with a high silica content, and obsidian is a dark, glassy rock formed from rapidly cooled lava.
How is andesite different from rhyolite and basalt?
There are rocks that are extrusive (formed quickly on the surface of the earth) or intrusive (formed within the earth under slow cooling). Both types of extrusive or intrusive rocks can vary in composition from mafic (high iron and magnesium content) to silicic (less heavy ions like Fe and Mg, but with more of the lighter elements like Ca, Na, K, etc.). Extrusive rocks range from most mafic to less mafic as such: Basalt, Andesite, Rhyolite (and are all fine-grained b/c they cooled quickly). Intrusive rocks that cool more slowly and have larger crystals range from most mafic to less mafic as such: Gabbro, Diorite, Granite. Basalt and gabbro have a similar composition, just the crystal size differs from different cooling rates (same for rhyolite and granite).
What rock forms volcanic lava cools?
Extrusive igneous rock. To be more specific you have to know the composition of the lava. The most common type is basalt, but other types include andesite, dacite, and rhyolite.
What are the magma types in order of decreasing viscosity?
Most viscous Felsic magma i.e. rhyolite Intermediate magma i.e. andersite Mafic magma i.e. Basalt Ultramafic magma i.e. Komatiite Least viscous
What is the difference between andesite and basalt?
Andesite is an intermediate volcanic rock that contains more silica and is lighter in color compared to basalt. Basalt is a fine-grained volcanic rock that is darker in color and forms from rapidly cooling lava at Earth's surface.
What rocks come from lava flow?
Lava flows cool to form extrusive igneous rock. Most lava flows consist of basaltic lava, cooling to form a dark rock called basalt. Some, however, may consist of andesite or, rarely, rhyolite and similar lavas.
Which pair of minerals is most likely to be found in felsic rock?
Quartz and feldspar are the most likely pair of minerals found in felsic rock. Felsic rocks are rich in silica, which forms minerals like quartz, and feldspar is another common mineral found in these rocks.
What type of rock forms most often near an active volcano?
The most common type of rock that forms near an active volcano is igneous rock. This type of rock forms from the cooling and solidification of magma or lava. Examples include basalt, andesite, and rhyolite.
What is the the most common rock in the Philippines?
The most common rock in the Philippines is basalt. Basalt is an extrusive igneous rock that is formed from the rapid cooling of lava and is commonly found in areas with volcanic activity.
What are the most common intrusive and extrusive rocks?
Some common intrusive rocks include granite, diorite, and gabbro, while common extrusive rocks include basalt, andesite, and rhyolite. Intrusive rocks form beneath the Earth's surface from slowly cooling magma, while extrusive rocks form from rapidly cooling lava on the Earth's surface.
What type of lava does mount st helens have?
Mt St Helen's eruption of 1980 was a pyrocastic flow diverse lava, ranging from olivine basalt to andesite and dacite). The magma is believed to come from another area laterally located to the east. Magma and rock under the volcano are cool.
