$(a)$ The temperature inside a glass enclosure is higher than that of the surroundings. Give a reason.
$(b)$ How is the above phenomenon utilized by cold countries to their advantage?
$(c)$ Name a greenhouse gas.

(N/A) Glass allows short-wave solar radiation to enter but traps long-wave infrared radiation (heat) reflected from the interior,leading to an increase in temperature inside the enclosure.
$(b)$ Cold countries use this phenomenon,known as the greenhouse effect,to build glass houses (greenhouses) that trap heat,allowing them to grow tropical plants even in freezing external temperatures.
$(c)$ Carbon dioxide $(CO_{2})$ or Methane $(CH_{4})$.