What's the Kennection? #198

What agricultural product was pictured on the back of the Lincoln penny from 1909 to 1958?

What color is peridot, the birthstone for the month of August?

"Dominating the T" is a winning strategy in what sport played on an indoor court and named for its soft rubber ball?

The rainiest place in the continental U.S. is found in the national park named for what Washington State mountain range?

What fictional underground country, ruled by the Queen of Hearts, can be entered via a rabbit hole in Oxfordshire?

What's the "Kennection"?