The ABCDE rule can be used to help you remember what a melanoma tumor typically looks like: 1  Asymmetry: The shape of one half of the mole does not match the other. 2  Border: The edges are ragged, notched, or blurred. 3  Color: The color is often uneven. Shades of black, brown, and tan may be present.
In many cases, heavy rains set off landslides. However, in many cases landslides may also occur in unpredictable was, such as the timing of a rockfall after a spring thaw. Sometime deep-seated slumps or mudflows will not move until days or weeks have passed after a storm.
The term landslide describes a wide variety of processes that result in the downward and outward movement of slope-forming materials including rock, soil, artificial fill, or a combination of these. The materials may move by falling, toppling, sliding, spreading, or flowing.