GeoTutor: Volcano Materials Extruded During an Eruption 4 of 16> The composition

Question

GeoTutor: Volcano Materials Extruded During an Eruption 4 of 16> The composition of lava is the most important characteristic in determining its behavior. The major compositional groups are: Basati la a has low silica tents-50%) and high eruption temperatures, causing them to flow rap dy and have a low voosty Basalts . ow far rom volcanic vents and form broad, sheet-ike lava flows Rhyolitic lava has high slica contents ~70%) and low eruption temperatures, giving them high viscosities. Rhyolitic lavas mound up and stay near the volcanic vent because of their resistance to flow Intermediate lavas, such as andesitic lava, have compositions, temperatures, and volatle contents between those of basalt and rhyolite. . The mineral composition of these groups determines each lava's prevalence. Some minerals melt more readly, leading to larger volumes onava. Basalts and rhyolites are thought to form earty and late in the melting process, respectively. More than 90% o the total volume of lava on Earth is estimated to be basaltic in composition, while my loos make up as little as 1% of the total. Andesites and other lavas account for most of the rest. By considering the compositional group and temperature of lava, we can evaluate the lava's viscosity and eruptive style. Drag the appropriate items into their respective bins View Available Hints) Reset Help slow lava flowllsn an hlava 190% of lavo on Earth flows in shoots Soflava on Enth fast lava fow||intern edate lava to Basaltic composition Andesitic composition

Explanation / Answer

Basaltic lava flow-

1) 90% of the lava on Earth. Most of the flows are basaltic in nature.

2) Fast lava flow. Among all the three types of lava flow, its the fastest.

3) Flows in sheets because of its minimal viscosity(due to lesser silica content of 50%)

Andesitic lava flow-

1) Intermediate lava flow. Due to its intermediate weight percent of silica(60%), it flows with an intermediate speed.

Rhyolitic lava flow-

1)Slow lava flow. It is the slowest of all.

2) Silica content is the highest(about 70%). That makes it viscous.

3) 1% of the lava on earth. Basaltic forms 90% and andesitic forms 10%. Rhyolitic is not that common.

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