A rock line or rock line is a form of landslide that loosens a large load of stone, soil and ice from a (mostly steep) mountain slope. Rocky lines often arise as a result of earthquakes, volcanic eruptions or a rapid drop in temperature when the slope is unstable or, as it happens, the cause. Steenlawines can end up a few kilometers from the slope depending on the area. If a rocky line comes into contact with a lot of water, it can turn into a modderlawine (lahar at volcanism) or puinstrome that can take off the conveyed material sometimes up to a few tens of kilometers.
A volcanic eruption often speaks of a rubble line. There are "hot" and "cold" debris. The first is due to volcanic activity, such as a volcanic earthquake or undermining because magma comes into contact with the slope, so that the slope becomes unstable; the second usually occurs without direct cause when a slope becomes unstable over time. Geological research has shown that the speed of a debris line increases with its size. This is due to the energy that comes with the rubble line. Big debris are known to feed rocks to more than 3 kilometers wide to a few kilometers from the source, reaching speeds of up to 300 kilometers per hour. Also see
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