According to the traditional beliefs of many aboriginal inhabitants of australia, the time when the world was transformed from a featureless and inactive realm into the world as we know it is known as the:

Dream time.

Explanation:

Australian aboriginals mythology includes the dream time or the dream time stories and is re[resented by the traditions performed by these people and such a myths variously tells about the truths of the local landscapes and they tend to layer the Australian topography with deeper meanings and cultural wisdom and ancestors knowledge.

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].