GEOLOGY

Detailed explanation-1: -Lower temperature magmas have higher viscosity than higher temperature magmas (viscosity decreases with increasing temperature of the magma).

Detailed explanation-2: -When temperature of liquid increases, the average kinetic energy of molecules increases. As a result, the molecules overcomes the intermolecular attractive forces between them as a result of which viscosity of a solution decreases.

Detailed explanation-3: -Lava may be erupted at a volcano or through a fracture in the crust, on land or underwater, usually at temperatures from 800 to 1, 200 °C (1, 470 to 2, 190 °F). The volcanic rock resulting from subsequent cooling is also often called lava.

Detailed explanation-4: -The viscosity decreases with an increase in temperature. Most liquids suffer the exponential relationship (Seeton, 2006) between temperature and viscosity rather than linear form (Fig. 6.1). The more viscous the fluid, the more sensitive it is to the temperature change.

Detailed explanation-5: -A magma’s silica content will not only control the rock type that forms, it also controls the relative viscosity of the magma. Differences in a magma’s viscosity will determine the shape a volcano takes. High-silica (basalt) magma has a much lower viscosity. It flows much easier and over longer distances.