You got a lot of points but it’s normal tbh
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.
#1 is B
'' We're going to volunteer at the animal shelter,'' said Dan, ''Do you want to come?''