Across
- 3. This Southeast Asian country has 17,500 islands and has 281 million people.
- 6. Most of this very large northern island is covered by ice 1.67 km thick on average.
- 9. People used these to have light before electric lamps.
- 13. This planet is known for its many beautiful rings.
- 14. This device is used by many people to speak to others far away and was invented in 1876.
- 16. These animals, some of which were the biggest animals ever, died out 60 million years ago.
- 17. A cloth to keep your neck warm in winter.
Down
- 1. An underground train used to move people.
- 2. Most of these animals fly, but some only walk, and some swim.
- 4. Very loud noise can damage these.
- 5. These are the "arms" of a tree.
- 7. This travels at 299,792 kilometers per second or 1,079,252,849 km/h. This is the fastest speed in the universe.
- 8. Humans may have become friends with these animals long ago because they are good at killing rats and mice that eat our food.
- 10. This language is spoken by more people than any other language.
- 11. This is a martial art, like Tae Kwon Do, and is popular in Japan.
- 12. Mountain climbers use lots of this to keep from falling.
- 14. This is a word for the main part of a tree and the main part of a human body.
- 15. The English alphabet comes from the alphabet used by these ancient people.
- 16. We study and work at these, usually sitting down.