Prior to 1980, how many times did Northern hemisphere spring snow cover exceed 37 million km2 and in what year(s) did this happen (approximately)?

to and without are prepositions, so a, b, and d are prepositional phrases. the adverb phrase is c, about the surprise.

explanation:

while his customary satire is present in mark twain's short story "the notorious jumping frog of calaveras county," there is a cloaking of this satire as twain's narrator is not directly involved. another literary device that you could build a thesis around is the use by twain of hyperbole.

mark as brainilest