May be caused by earthquakes, floods, storm winds, tornadoes, or mud flows.

Land slides can be caused by earthquakes, floods, storm winds, tornadoes, or mud flows. Land slides can be caused by all of this natural occurrences, they usually appear on places where the ground is more labile, has little or no vegetation, is heavily affected by erosion, there's shallow underground waters, and always the land is under some angle, usually bigger and it is a steep land, so any bigger disturbance causes big masses of ground to move downwards, thus the land slide appears.

Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].