Answer: a block of ice as long as a football field.
An appositive is a noun or noun phrase which identifies in a different way another noun placed beside it. In this case, the phrase "a block of ice as long as a football field" is a phrase that is renaming the noun "glacier." Appositives are usually set off by commas.
It was at a public science exhibit but I may be wrong
<span>i think the correct answer would be Homophones</span>
