Questions & Answers about Сверху падали снежинки, и мне стало спокойно.
Сверху means from above, from the top, or sometimes simply down from overhead.
In this sentence, it tells you where the snowflakes were falling from:
- Сверху падали снежинки = Snowflakes were falling from above
It is an adverb, so there is no preposition before it here.
A learner might compare:
- сверху = from above / from the top
- вверху = above / up above
So here сверху emphasizes the source/direction of the falling.
Because the subject is снежинки, which is plural.
- снежинка = snowflake
- снежинки = snowflakes
Russian past-tense verbs agree with the subject in gender/number:
- падал = he/it (masculine) was falling
- падала = she/it (feminine) was falling
- падало = it (neuter) was falling
- падали = they were falling
Since snowflakes are plural, the verb must be падали.