What is the best example of a supporting detail? A fact that elaborates on the point of the writing.
The use of all four types of sentences in the writing.
A variety of sentence lengths throughout the writing.
A great clincher sentence at the end of the writing.
(critical thinking)

A fact that elaborates on the point of the writing.

Explanation:

A supporting detail is there to support the writing and make it sound more clear, detailed and precise.

This statement is not true. 

 A mirage is simply an optical effect that is sometimes seen at sea, in the desert or over a hot pavement that may have the appearance of a pool of water or a mirror in which distant objects are seen inverted . This is caused by the bending or reflection of rays of light by a layer of heated air of varying density. 

There are two kinds of mirages: superior mirage and inferior mirage. In a superior mirage, the image of an object appears above the actual object. In an inferior mirage, the image of the object appears below the actual object usually mirrored upside down.