1 No early symptoms. 2  Blood in the urine - often intermittently. 3  Kidney area lump. 4  Abdominal swelling.  No pain - there is not usually any kidney pain unless the tumor is very advanced.
Gas content varies depending on what sort of material melted to form the magma. As a general rule, the most explosive eruptions come from magmas that have high gas levels and high viscosity, while the most subdued eruptions come from magmas with low gas levels and low viscosity.
Since volcanic eruptions are caused by magma (a mixture of liquid rock, crystals, and dissolved gas) expelled onto the Earth's surface, we'll first review the characteristics of magma that we covered previously.