Because the mountains are relatively young, in geological time, they still grow and erode. Mr. Van Waginene’s flights help track this corrosion. Inside his plane, a GPS camera and a battery. When it strikes a button, the camera begins to click, taking one photo every second. The United States Geological Survey in the United States is in one continuous form. Using time breaks, they can compare the coast over time and try to capture landslides before they have severe consequences. They have achieved some success with slow slides. But irregular rock makes the prediction of future debris flows impossible. “We have learned to be precedent,” says Kate Nouvoa, a population for a long time. “The road will be closed.” “The only question is, where, when, and for how long?”