R-Controlled vowels er and ir

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Across
  1. 5. How you feel when you want a drink
  2. 6. Soil or earth you find in the garden
  3. 7. A group of animals, like cows, moving together
  4. 8. Not clean; covered in dirt
  5. 11. To move in a spinning or twisting way
  6. 13. A tiny thing that can make you sick
  7. 14. You might spread this on toast or bread
Down
  1. 1. The coldest season of the year
  2. 2. The day each year when you celebrate being born
  3. 3. Mixing something round and round, like soup
  4. 4. The opposite of “over”; beneath something
  5. 9. Number that comes after second
  6. 10. A word that means an action, like “run” or “eat”
  7. 12. A written symbol of the alphabet, or a note you send