Crossword

5. - A high landmass; often has steep sides and a peak.
7. - A call to take part in a contest or competition, typically against others.
10. - The answer to or resolution of a problem or puzzle.
11. - Reasoning conducted according to strict principles of validity and soundness.
13. - Something that is difficult or impossible to understand or explain.
15. - A question or statement that requires thought to answer or understand.

1. - A plan of action designed to achieve a long-term or overall aim.
2. - Information and understanding acquired through experience or education.
3. - To find something for the first time or to realize a truth or fact.
4. - The organ inside your head that controls thoughts, memory, feelings, and activity.
6. - A puzzling or inexplicable occurrence or situation.
8. - A confusing and difficult problem or question.
9. - A game or problem designed to test ingenuity or knowledge.
12. - A piece of evidence or information used to solve a problem or mystery.
14. - A secret or disguised way of writing; a code.