How much dirt is in a hole riddle

Question: How much dirt is in a hole that has a radius of 33.2 meters and a height of 78.2 meters?

Question: What do you call a sad bird?

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Question: What can be broken but never forgotten?

Question: What tastes better than it smells?

Question: People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?