Which sentences contain an adverb clause?
darla set up a studio because she enjoyed painting.
as aaron was having a midnight snack, he heard a loud noise coming from the basement.
the entire town was searching for the girl with the red hair.
they listened to what he had to say but disagreed with him in the end.

An adverb clause is a dependent clause (subordinate conjunction+subject+verb) that functions as an adverb, answering how?, when?, where? or why?

Within this list, there are two sentences that contain an adverb clause:

either a donut or a sphere or a pancake or a flat sphere. it depends on where the vertical line is.

if the line goes through the center of the circle and is perpendicular to a diameter containing the center, then you get a flat circle.

if the line and the diameter of a the circle meet in the center of the diameter and at an angle, you get a pancake.

if the line is on the circumference of the circle and is at right angles   to the circle you get a ring.

if the line contains the diameter, you get a sphere.

the the line is parallel to the diameter and touches the circumference, you get a donut.