(i) Snow has air trapped inside it, so it is better insulator than ice
(ii) Young's modulus of steel is gratr than rubber 
(iii) Rocket motion happens due to the combustion product pushes the rocket forward
(iv) ${\mathrm{p}}_1-{\mathrm{p}}_0=\frac{2\mathrm{T}}{{\mathrm{R}}_1}$

${\mathrm{p}}_2-{\mathrm{p}}_0=\frac{2\mathrm{T}}{{\mathrm{R}}_2}{\mathrm{R}}_1>{\mathrm{R}}_2$

$\Rightarrow {\mathrm{p}}_1-{\mathrm{p}}_2=2\mathrm{T}\left[\frac{1}{{\mathrm{R}}_1}-\frac{1}{{\mathrm{R}}_2}\right]$

Excess pressure inside smaller bubble is high thna bigger bubble. So, moves from smaller bubble to bigger one.