Which of the following statements about idea models is not true?
a. idea models depict a concept.
b. idea models are typically used to predict natural disasters.
c. idea models are typically in the form of a graph or equation.
d. idea models are used to show the relationship between variables.

The correct option is B.

Idea models refers to those models that are used to show the relationships that exist between abstract concepts. The model is used basically to bring about desired changes and it normally used in business and other sectors to visualize how an idea might work out. Idea models are usually presented in form of graphs and equations, the variables in these graphs and equations show the relationships between the variables that are been considered.

is this a psat question, if so do not cheat try your best.