3rd one

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Across
  1. 1. - Oceanic collectible
  2. 3. - All of space and time
  3. 4. - Green summer squash
  4. 6. - Juicy, summertime fruit
  5. 8. - Colorful garden flower
  6. 11. - One who plays a stringed instrument
  7. 12. - Large, gentle giant
  8. 14. - Captured image
  9. 15. - Erupting mountain
  10. 17. - Insect with colorful wings
  11. 18. - Large river-dwelling mammal
  12. 20. - Inflatable seaside toy
Down
  1. 2. - Beach sculpture
  2. 5. - Sweet treat made from cacao
  3. 7. - Multicolored meteorological phenomenon
  4. 9. - Elevated landform
  5. 10. - Explosive displays of light
  6. 13. - Space explorer
  7. 16. - Bold explorer
  8. 19. Cream - Frozen dessert treat