This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Hi there,
thermal decomposition is the decay of a substance  due to naturally occurring  conditions.
 thermal disassociation is breaking the bonds of the molecule with the influence of heat.
i hope this helps u..  
2 3 2
Thermal dissociation is reversible but thermal decomposition is irreversible
1 4 1