WONDER #1741: What Is a Burl?

Question 1 of 3

Normal wood grain runs in how many directions?

1. one
2. two
3. three
4. five

Question 2 of 3

Of the following tree species, which one is likely to have the least valuable burls?

1. walnut
2. redwood
3. maple
4. oak

Question 3 of 3

Which of the following is NOT considered a possible cause of burls?

1. insects
2. fungi
3. pollution
4. sloths

Check your answers online at https://www.wonderopolis.org/wonder/what-is-a-burl.