How does temperature affect viscosity of magma?
MAGMA VISCOSITY, TEMPERATURE, AND GAS CONTENT. The effect of temperature on viscosity is intuitive. Like most liquids, the higher the temperature, the more fluid a substance becomes, thus lowering its viscosity. Composition plays an even greater role in determining a magma’s viscosity.
What are the factors that affects the viscosity of magma?
Viscosity of Magmas Viscosity is the resistance to flow (opposite of fluidity). Viscosity depends on primarily on the composition of the magma, and temperature. Higher SiO2 (silica) content magmas have higher viscosity than lower SiO2 content magmas (viscosity increases with increasing SiO2 concentration in the magma).
What increases viscosity of magma?
In other words, as magma cools, its viscosity increases. This property is increased by crystallization of magma while temperature decreases. Finally, the composition of a magma highly affects its viscosity. A higher concentration in silica leads to a more acid/more viscous magma.
Which type of volcano has the highest viscosity?
shield volcanoes
Which magma would have the highest viscosity and be the most explosive?
Rhyolitic magmas
What are 3 types of magma?
There are three basic types of magma: basaltic, andesitic, and rhyolitic, each of which has a different mineral composition. All types of magma have a significant percentage of silicon dioxide. Basaltic magma is high in iron, magnesium, and calcium but low in potassium and sodium.
What type of magma flows the fastest?
PAHOEHOE
Which region has the greatest concentration of currently active volcanoes?
The greatest concentration of volcanoes has been found in Antarctica—and that’s terrifying news. Hidden monsters. August 14, 2017 This article is more than 2 years old. Everything about Antarctica is hyperbolic.
Does basic lava have a high silica content?
Lava: Magma that reaches the earth’s surface is called lava. It may be acidic or basic. Acidic lava is viscous, is lighter in colour and has higher silica content. Basic lava is non-viscous, is darker in colour and has lower silica content.
Why is it dangerous to live near an active volcano?
Volcanic pollution – While active, a volcano can be a natural source of pollution. Volcanoes release ash, gas, and magma into the air and onto the ground. Explosive eruptions would spread the danger out farther than just the direct proximity of the volcano. …
How would you know if the volcano is active and about to erupt?
An increase in the frequency and intensity of felt earthquakes. Noticeable steaming or fumarolic activity and new or enlarged areas of hot ground. Subtle swelling of the ground surface. Small changes in heat flow.
How does living near a volcano impact people?
Volcanoes can provide people with many benefits such as: volcanic rock and ash provide fertile land which results in a higher crop yield for farmers. tourists are attracted to the volcano, which increases money to the local economy. geothermal energy can be harnessed, which provides cheaper electricity for locals.
What are the economic impacts of a volcanic eruption?
The most common consequences of volcanic events include loss of life, respiratory illness, and severe economic losses, including destruction or damage to housing, infrastructure, and land.
What are the positive and negative effects of volcanic eruption?
Positive: Lava and Ash deposited during an eruption breaks down to provide valuable nutrients for the soil… this creates very fertile soil which is good for agriculture. Negative: Deadly and devastating Lahars are made when… ash and mud from an eruption mixes with rain or melting snow making fast moving mud flows.