Answer to Question 1
ANSWER: Large snowflakes are those that fall through moist air that is slightly above freezing. In this condition the snowflakes slowly melt as they descend. A thin film of water forms on the edge of the flakes, acting like glue when other snowflakes come in contact with it. In this way, several flakes can join to produce giant snowflakes often measuring several inches or more in diameter. When snowflakes fall through extremely cold air with a low moisture content, small, powdery flakes of dry snow accumulate on the ground.
Answer to Question 2
ANSWER: Raindrops that reach Earth's surface are seldom larger than about 5 mm (0.2 in.), the reason being that the collisions (whether glancing or head-on) between raindrops tend to break them up into many smaller drops. Additionally, when raindrops grow too large they become unstable and break apart.
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