Unpredictable.
Was it only last week that we saw the eruption of a volcanoe in Japan, with the sad loss of many lives. This is how our planet works, we may know much and speculate more. We may have many ideas and may even be able to predict some, but we will be caught out.
It is only God who knows everything and if we follow Him, we will be a bit wiser not to be to keen to venture into dangerous places unless He tells us to go.
Luke 21:11, Hebrews 11:8-9, 1 Peter 1:7.
Ask me and I will tell you! 