Spelling words for week of April 4

1. pollen 2. even 3. urban 4. seven 5. kitchen 6. reason 7. human 8. season 9. burden 10. wagon 11. oven 12. dragon 13. horizon 14. orphan 15. sudden 16. eleven 17. button 18. canyon 19. slogan 20. golden CHALLENGE words: ecosystem, precipitation, region, climate, creatures