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.
In some volcanic eruptions, the molten rock-called magma when it is underground and lava when it reaches the surface-flows slowly out of the vent. In more violent eruptions, lava shoots straight up, and rock fragments are ejected in a great cloud of ash-laden gas that rises high into the air.