WORD SPIRAL

Starting from 1, fill in the grid clockwise with four-letter words. The last letter of each word becomes the first letter of the next to reveal a South American river.

1. Heavy metal 2. Cloudy 3. Public pool 4. Formerly 5. Wicked, bad 6. Missing 7. Group of three 8. Lubricates

9. Japanese wrestling 10. Of the ears 11. Fossil fuel 12. Quiet spell 13. Nobleman 14. Small pointed missile 15. Roman garment 16. Related by blood