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What is the difference in composition between a dacite and an andesite?
The main difference between dacite and andesite lies in their silica content. Dacite has a higher silica content than andesite, making it more viscous. Dacite also typically contains more quartz and less mafic minerals than andesite.
Which minerals can be found in all samples of rhyolite and andesite?
Both rhyolite and andesite typically contain the minerals quartz, feldspar (particularly plagioclase and alkali feldspar), and biotite. They may also contain other minerals such as hornblende or pyroxene, though these are more variable. The presence of these minerals contributes to their characteristic compositions and textures. Rhyolite is generally more silica-rich than andesite, resulting in differences in mineral proportions.
What describes an andesite?
Andesite are fine-grainedextrusive, igneous volcanic rock composed essentially of plagioclase feldspar and one or more mafic minerals, such as hornblende, pyroxene or biotite.(Refer to Geology.com -Igneous Rocks)
Are Basaltic lavas are generally hotter and more viscous than andesite lavas?
No, basaltic lavas are typically hotter and less viscous than andesite lavas. Basaltic lavas have lower silica content, which results in their lower viscosity and ability to flow more easily. Andesite lavas, on the other hand, have higher silica content and are more viscous.
Are Basaltic lavas generally hotter and more viscous than andesite lavas?
Basaltic lavas are generally hotter and less viscous than andesite lavas. Basaltic lavas have lower silica content, which makes them flow more easily. Andesite lavas, on the other hand, have higher silica content, making them cooler and more viscous.
Which rocks contain dark silicate materials and plagioclase feldspar?
Igneous rocks, specifically basalt and andesite, typically contain dark silicate minerals such as pyroxene or amphibole alongside plagioclase feldspar. These rocks are formed from the rapid cooling of lava or magma and are commonly found in volcanic regions. Basalt is rich in iron and magnesium, giving it a darker color, while andesite has a more intermediate composition. Both types of rock are essential in understanding the geological processes of the Earth's crust.
Distinguish between andesite and diorite using two physical properties of igneous rocks?
Andesite typically has a light to dark gray color with a fine-grained texture, while diorite is usually darker in color with a coarse-grained texture. Additionally, andesite usually contains more silica than diorite, leading to differences in their mineral compositions and overall chemical makeup.
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.
Why are animals less stressed in the dark?
most animal i know are more stressed in the dark
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 is the protolith of andesite?
The protolith of andesite is typically basalt or other mafic volcanic rocks. Andesite forms through the partial melting of these basalts in subduction zone environments, where water and other volatiles lower the melting point of the rock. Additionally, andesite can also originate from the mixing of basaltic magma with more evolved, silica-rich materials. This results in andesite's intermediate composition, which lies between basalt and rhyolite.
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).
