What causes mafic magma?
At the latter locations, mafic magma originates in the upper mantle and rises into the breach caused by diverging lithospheric plates. The resulting underwater eruptions produce long linear, basaltic mountain ranges and large areas covered with lava called flood basalts.
What type of lava is mafic?
Mafic lavas are lavas rich in iron and magnesium, while being low in silica. Basalt is the solidified version of mafic lava. Mafic lavas are the most common lava type on earth. Mafic lavas are also the hottest lavas and normally erupt at over 900 degrees Celsius – that’s 1,650 degrees Fahrenheit!
What affects the viscosity of lava?
Viscosity of Magmas Viscosity is the resistance to flow (opposite of fluidity). Depends on composition, temperature, & gas content. Lower Temperature magmas have higher viscosity than higher temperature magmas.
What aspect of mafic lava is important?
Questions – Volcanoes 1
|Which aspect of mafic lava is important in the formation of smooth, ropy pahoehoe lava?||a. a fairly high viscosity b. a fairly low viscosity c. rapidly deforming crust d. rapid underwater cooling|
Why does mafic lava have a steep side?
Since felsic lava does not flow easily, it tends to form steep sides. Mafic lava (silica-poor; example: basalt) has low viscosity (think ketchup), which allows gas bubbles to easily escape and results in effusive eruptions, where lava pours out of the ground. Since mafic lava flows easily, it can cover very long distances.
Where did the name mafic lava come from?
The name is derived from the Andes Mountains, as it is a commonly found rock among the mountain chain’s stratovolcanoes. “Mafic” is a term used to describe the densest lava flows. The word derives from a composite of the chemical symbols for Magnesium (Ma) and Iron (Fe).
Which is an example of a mafic lava eruption?
Mafic lava (silica-poor; example: basalt) has low viscosity (think ketchup), which allows gas bubbles to easily escape and results in effusive eruptions, where lava pours out of the ground.
What makes a basaltic lava a mafic lava?
Basaltic lava, or mafic lava, is molten rock enriched in iron and magnesium and depleted in silica. Basaltic magmas are formed by exceeding the melting point of the mantle either by adding heat, changing its composition, or decreasing its pressure.