A mudflow or mud flow is a form of mass wasting involving "very rapid to extremely rapid surging flow" of debris that has become partially or fully liquified by the addition of significant amounts of water to the source material.
Mudflows contain a significant proportion of clay, which makes them more fluid than debris flows; thus, they are able to travel farther and across lower slope angles. Both types are generally mixtures of various kinds of materials of different sizes, which are typically sorted by size upon deposition.
Mudflows are often called mudslides, a term applied indiscriminately by the mass media to a variety of mass wasting events. Mudflows often start as slides, becoming flows as water is entrained along the flow path; such events are often called flow slides.
Other types of mudflows include lahars (involving fine-grained pyroclastic deposits on the flanks of stratovolcanoes) and jökulhlaups (outbursts from under glaciers or icecaps).
A statutory definition of "flood-related mudslide" appears in the National Flood Insurance Act of 1968, as amended, codified at 42 USC Sections 4001 and following. The NAS [National Academy of Sciences] has reported several studies of 'mudslides'.
I?ll rise from the ashes
Of World War III
Destroying all remaining creatures
That threaten me
Pray for the day when you?ll see
My severed head
World War IV won?t be over
Till I am dead
I sacrifice my life
To gain my strength
I?ll drink the blood from the grail of
Medieval Saints
Pray for the day when you?ll see
My severed head
World War IV is a battle of
Our living dead
Who shall fight
Who will fight me
Who shall fight