Concept:Match each weather term in List I with its correct definition in List II.
Explanation:A. Blizzard means a severe snowstorm with strong winds, so A matches 3.
B. Tornado is a violently rotating destructive column of air extending from a thunderstorm to the ground, so B matches 4.
C. Thunderstorm is a storm with thunder and lightning, usually with heavy rain, so C matches 2.
D. Typhoons are tropical cyclones over the western Pacific Ocean, so D matches 1.
Answer:The correct matching is A=3, B=4, C=2, D=1.
Hence, the correct code is 3 4 2 1.