Different processes are given in Column - $\mathrm{I}$ and its reasons are given in Column - $\mathrm{II}$. Match the appropriately.
| Column - $\mathrm{I}$ | Column - $\mathrm{II}$ |
| $(a)$Rain drops moves downwards with constant velocity. | $(i)$ Viscous liquids |
| $(b)$ Floating clouds at a height in air. | $(ii)$ Viscosity |
| $(iiii)$ Less density |
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$(a-i i),(b-i i i)$
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