Table of Contents
- 1 What makes lava have a higher viscosity?
- 2 Why is rhyolitic magma highest viscosity?
- 3 Which fluid has the highest viscosity?
- 4 Does andesitic magma have high viscosity?
- 5 Does toothpaste have high viscosity?
- 6 How big do rhyolite lava flows usually occur?
- 7 Which is an example of a low viscosity lava?
- 8 How does the viscosity of lava affect the shape of a volcano?
What makes lava have a higher viscosity?
Composition: he more felsic the lava (the more silica in the lava), the higher the viscosity because silica forms chains in the cooling lava even before it crystallizes. The more mafic the lava (the less silica in it), the lower the viscosity.
Why is rhyolitic magma highest viscosity?
Magma Composition: Such magmas erupt as andesites and rhyolites or are intruded as granite masses. The more extensive silicate chain molecules render these magmas highly viscous, so when eruption occurs it is usually explosive (e.g. Mt St Helens).
Is lava high or low viscosity?
Although lava can be up to 100,000 times more viscous than water, with a viscosity roughly similar to ketchup, lava can flow great distances before cooling and solidifying because lava exposed to air quickly develops a solid crust that insulates the remaining liquid lava, helping keep it hot and inviscid enough to …
Which fluid has the highest viscosity?
Honey is between 2,000 and 10,000 times more viscous than water. Some fluids are so viscous they appear to be solid and yet, over time, slowly flow. One of the most viscous liquids known is pitch, also known as bitumen, asphalt, or tar.
Does andesitic magma have high viscosity?
Explosive eruptions are favored by high gas content and high viscosity (andesitic to rhyolitic magmas)….Viscosity of Magmas.
| Summary Table | Magma Type | Basaltic |
|---|---|---|
| Solidified Rock | Basalt | |
| Chemical Composition | 45-55 SiO2 %, high in Fe, Mg, Ca, low in K, Na | |
| Temperature | 1000 – 1200 oC | |
| Viscosity | Low |
What are examples of high viscosity liquids?
Honey, syrup, motor oil, and other liquids that do not flow freely, like those shown in Figure 1, have higher viscosities.
Does toothpaste have high viscosity?
Viscosity is a physical characteristic of fluids that demonstrates resistance to motion or flow. Water is an example of a low viscosity (thin) liquid, while toothpaste is an example of a high viscosity (thick) liquid.
How big do rhyolite lava flows usually occur?
There has been a significant amount of controversy, therefore, over rare rhyolite lavas that appear to occur as large-volume flows (10-100 cubic kilometers). Most such flows occur near continental hotspots.
What kind of rock is a rhyolite made of?
Rhyolite occurs in the form of volcanic plate and lava basin ( Fig. 4.33) with relatively large thickness and small propagation due to the high viscosity and low capacity of lava flow. Rhyolite is suitable as aggregate, fill-in construction, building material and road industries, decorative rock in landscaping, cutting tool, abrasive and jewelry.
Which is an example of a low viscosity lava?
An example of a low viscosity (fast flowing) lava is basaltic lava. This flows quickly out of a volcano at a temperature of about 950 degrees Celsius. This flows out for great distances creating shield volcanoes or flood basalt fields. An example of high viscosity lava is felsic lava, like rhyolite or dacite.
How does the viscosity of lava affect the shape of a volcano?
And the lava viscosity defines the size and shape of a volcano. Even though lava is 100,000 times more viscous than water, it can still flow great distances. When lava has low viscosity, it can flow very easily over long distances.