Which of the following describes how a lake might form? A volcano creates a crater that water can pool into.
An earthquake moves the land, creating a space for water to collect.
A glacier removes land as it travels down a mountain; water collects in the space left behind.
All of the above

can you rephrase the question ? it is unclear : -)

step-by-step explanation:

answer: on graphs, the open and closed circles, or vertical asymptotes drawn as dashed lines us identify discontinuities.

as before, graphs and tables allow us to estimate at best.

when working with formulas, getting zero in the denominator indicates a point of discontinuity.

when working with piecewise-defined functions, check for discontinuities at the transition points where one piece ends and the next begins.

step-by-step explanation: