The figure provided shows three solid blocks, each at a different temperature. In which direction will heat flow?
A: from sample 2 to sample 3

B: from sample 3 to sample 1
C: from sample 1 to sample 2

D: from sample 3 to sample 2

Combustion is the act or process of burning. therefore, i believe the answer is  a: burning wood. 

The question is incomplete. complete question is attached belowanswer: correct answer is option b  i.e.  solid particles  reason: filter paper has small pores, through which smaller particles can pass through. however, solid particles  have relatively larger size. hence, they are least likely to pass through.

Ithink d hope that