Indonesia's deadly volcano unleashed another powerful eruption Monday, spewing searing clouds of gas and ash thousands of feet into the air to the sound of a booming explosion. There were no immediate reports of new casualties. On the other side of seismically charged country, a break in weather was helping rescuers get aid to victims of a tsunami that slammed into several remote islands, sweeping entire villages to sea. The twin disasters, which occurred almost simultaneously one week ago, have together killed nearly 500 people. Mount Merapi, among 20 mountains now rumbling and spitting out ash in Indonesia, is one...