complete the sentence with the correct comparative or superlative adjective. flat australia is completely…

complete the sentence with the correct comparative or superlative adjective. flat australia is completely surrounded by water and is the of all the worlds continents.
Answer
Brief Explanations:
The superlative form of "flat" is used when comparing Australia to all other continents. The superlative of "flat" is "flattest".
Answer:
flattest