let's start with eug yooeshz indonesia at least eight were killed, dozens missing, a massive search and rescue effort is ongoing. the mudslide swept away more than 100 homes. let's look into more about what causes landslides, because it is not just in indonesia, as i mentioned. derek van dam joins us, california saw the same thing. >> yes, they saw more of a mudslide, which is more of a liquid mud that rushes down mountain sides. let's talk about what happens in java before we move to california. a terrible tragedy in java, the world's most populous island, by the way. lately, this area has been hit with rainfall persistently. that rainfall builds up into the