<P> The earthflow , a slow moving landslide , crawled down the valley about 700 years ago creating the 4 miles ( 6.4 km ) long and 2,000 feet ( 610 m ) wide mass . The earthflow lies a few miles south east of Lake City . The landmark site covers 1,291 acres ( 522 ha ) and is owned by the US Forest Service and the Bureau of Land Management . It is `` a striking example of mass wasting ( the movement of large masses of earth material ) . '' Lake San Cristobal was dammed by the earthflow . A second earthflow has been moving continuously for about 300 years over older stable rock . It moves at a rate of about 7 meters ( 23 feet ) per year . </P>
<P> The earthflow , a slow moving landslide , crawled down the valley about 700 years ago creating the 4 miles ( 6.4 km ) long and 2,000 feet ( 610 m ) wide mass . The earthflow lies a few miles south east of Lake City . The landmark site covers 1,291 acres ( 522 ha ) and is owned by the US Forest Service and the Bureau of Land Management . It is `` a striking example of mass wasting ( the movement of large masses of earth material ) . '' Lake San Cristobal was dammed by the earthflow . A second earthflow has been moving continuously for about 300 years over older stable rock . It moves at a rate of about 7 meters ( 23 feet ) per year . </P>
what type of mass movement is the slumgullion slide
what type of mass movement is the slumgullion slide
a slow moving landslide
a slow moving landslide