read the sentence. what is the compound subject of the sentence? the snow and ice that arrived last night…

Brief Explanations:

A compound subject is two or more individual nouns or pronouns joined by a coordinating conjunction (like and). In the sentence "The snow and ice that arrived last night elated kids and adults alike when they awoke to a winter wonderland", "snow and ice" is what the sentence is mainly about in terms of the action - they are the entities that arrived and caused the elation. "night" is part of a prepositional phrase, "kids and adults" are the objects of the action "elated", and "they" is a pronoun referring to "kids and adults".

Answer:

snow and ice