On Thanksgiving Eve our thoughts naturally turn to food. Let’s see how you do on this week’s quiz, which deals with edible plants growing in national parks. (We’ll leave hunting and fishing out of this one, since we plan to put together separate quizzes for these activities.) Answers are at the end.

It doesn't get much publicity, but some of the most interesting scuba diving in the U.S. takes place in our national parks. So grab your fins, masks, snorkels and regulators and have a go at this week's quiz. Answers are at the end. If we catch you peeking, we’ll put sand in your wetsuit.

This week’s quiz deals with rivers flowing within or through the national parks. Answers are at the end. If we catch you peeking, we’ll make you write “Tributaries joining main streams at right angles is a signature feature of trellis drainage” 100 times on the whiteboard.

This week’s quiz focuses on border parks-- that is, the parks that border on Canada or Mexico. Answers are at the end. If we catch you peeking, we’ll make you take a TSA training course. Aaaaaaargh!!

Halloween is the day after tomorrow, so let’s turn to the scarier side of national park visitation for this week’s quiz. Answers are at the end, but please don’t peek. Cheaters never prosper – unless, of course, they work on Wall Street.

This week’s quiz focuses on troubled species. Answers are at the end. If we catch you peeking, we’ll make you write “Encountering a four-meter Crocodylus acutus can cause severe de-puckering of the anal sphincter” 100 times on the whiteboard.

Are you chronologically challenged? Take this week’s quiz and find out. Answers are at the end. If we catch you peeking, we’ll make you write “Isotopic stratigraphy, a branch of chemostratigraphy, should not be confused with lithostratigraphy or cyclostratigraphy.” 100 times on the whiteboard.

Quiz 10 on July 9 was “Speak of the Devil.” Fair is fair, so this week we’ll turn the focus in the heavenly direction and deal with angels, saints, and such. Answers are at the end. If we catch you peeking, we’ll make you write “The cognitive complexities of the term ‘saint’ render lexical disambiguation extraordinarily challenging” 100 times on the whiteboard.

You’ll have fun with this week’s quiz, even if you don’t stride or ride the national park trails. Answers are at the end. If we catch you peeking, we’ll make you remove the meadow muffins from our favorite hiking trail.

While past quizzes have focused on specific genre involving the National Park System, this week's quiz is a more wide-open, undefined quiz of national park trivia. Answers are at the end.

A waterfall is defined as a steep descent of water from a height. Whatever you call these falling waters, they delight the senses. This week’s quiz will see how much you know about waterfalls in the national parks. Answers are at the end. If we catch you peeking, you’ll be assigned plunge pool cleaning duties.

This week’s quiz tests your knowledge of geologic features and processes in the national parks that lie within the Pacific Ring of Fire, an area of frequent earthquakes and volcanic eruptions that rings the Pacific Basin. Answers are at the end. If we catch you peeking, we'll make you write "convergent boundary" 100 times on the whiteboard.

There are lots of interesting historic houses in our national parks, and if you know a thing or two about them you’ll do just fine on this week’s quiz. Answers are at the end. If we catch you peeking, we’ll make you wash windows.

A mountain is “a natural elevation of the earth's surface having considerable mass, generally steep sides, a discernible peak, and a height greater than that of a hill.” This week’s quiz will see how much you know about mountains in the national parks. Answers are at the end. No peaking, please.

Women’s achievements are underrepresented in the National Park System, but some parks have been dedicated for that purpose and some others include exhibits, statues, or other features honoring women. Take this week’s quiz and see if your left-brain thinking is up to speed. Answers are at the end. No peeking, please.