Answer:
It emphasizes the author's argument that Antarctica is not being utilized nearly enough
Explanation:
Based on the sentences, Antarctica is an overlooked and vastly underused continent as it has vast resources from fish to minerals to oil.
Based on the usage of the word "vastly", the effect the word has on the author's purpose is that it emphasizes the author's argument that Antarctica is not being utilized nearly enough
When it said she was a bit of a BRAT.
