GEOLOGY

Detailed explanation-1: -Felsic lavas are not as hot, high in silica and volatiles, and have a high viscosity. They are thick and gooey and resist flowing. Their high volatile content makes them potentially highly explosive.

Detailed explanation-2: -Rhyolitic/Andesitic Lava Magma that has a higher viscosity and silica content produces rocks that are called rhyolite and andesite.

Detailed explanation-3: -Rhyolitic magma contains the most silica. Other types of magma have less silica in them. Basaltic magma has only 45 to 55 percent silica, and andesitic magma has about 55 to 65 percent. Rhyolitic magma also has a lower temperature than the other magma but higher viscosity and gas content.

Detailed explanation-4: -Felsic magmas are higher in silica and contain lighter colored minerals such as quartz and orthoclase feldspar. The higher the amount of silica in the magma, the higher is its viscosity. Viscosity is a liquid’s resistance to flow.

Detailed explanation-5: -Basaltic magma-1000 to 1200oC. Andesitic magma-800 to 1000oC. Rhyolitic magma-650 to 800oC. 14-Sept-2015