Team building puzzle

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Across
  1. 1. This Swedish group dominated global pop in the 1970s and had a major revival thanks to a musical named after one of their songs.
  2. 4. I speak without a mouth and hear without ears. I have no body, but I come alive with wind. What am I?
  3. 6. A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?
  4. 7. What can you break without touching it?
  5. 9. What do you call a bear with no teeth?
  6. 11. I’m an odd number, but take away a letter and I am even
  7. 12. What goes up but never comes down?
  8. 13. What word in the English language does the following:The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire word signifies a great woman. What is the word?
  9. 14. Forward, I am heavy; backward, I am not. What am I?
  10. 15. A is the brother of B. B is the brother of C. C is the father of D. So how is D related to A?
Down
  1. 2. What English word has three consecutive double letters?
  2. 3. This German singer released a Cold War–inspired protest song about red balloons accidentally starting a war.
  3. 5. Which word in the dictionary is spelled incorrectly?
  4. 8. What disappears as soon as you say its name?
  5. 10. What begins with an “e” and only contains one letter?