Question

There is shimmering of air just above the soil during hot summer day, what does the term shimmering indicates?

Answer 1

The explanation is as follows.

Firstly the meaning of word shimmering is to shine with a soft, slightly wavering light.
Now here, when during summer days the air near ground becomes hot this effect is observed.
It is also called 'miraz ' or 'mrig marich' which is generally observed on roads where a false visualisation of water happens.

Hope it answers your question.
All the best!