Thermals are rising parcels of the air that are warmer than the surrounding air Option(d) is correct.
What is Thermals?
Thermals are known to be as caused by thermal stress which is basically involved a state of the matter dependent upon the overall temperature thermal.
The rising which look like or actual are the parcels which are basically warmer more than the surrounded air.
Therefore Option(d) is correct.
Learn more about Thermals here:
brainly.com/question/20885658
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