Challenge

6. / Celsius
8. / threat, something that is likely to cause harm (formal)
9. / a medical condition in which parts of the body, (fingers and toes) become damaged as a result of extremely cold temperatures
12. / (adj.) sth that can be reached, especially by making an effort for a long time
13. coverage / media interest
14. / a business or company
15. / likely to happen very soon

1. / the most important or successful part of something
2. / very strange, unusual or unexpected
3. / having a lot of natural ability or intelligence
4. / curious, wanting to discover as much as you can about things
5. / lacking order or organization, chaotic, disorganized
7. / an attempt to do something, especially something new or difficult
10. / an organized journey with a particular purpose, especially to find out about a place that is not well known
11. / that is possible and likely to be achieved, synonym practicable