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Phrase:    11. soil erosion Phonics:   Audio:	Phrase:    12. desertification Phonics:   Audio:
Phrase:    13. topsoil Phonics:   Audio:	Phrase:    14. prolonged drought Phonics:   Audio:
Phrase:    15. over-cultivation Phonics:   Audio:	Phrase:    16. overgrazing Phonics:   Audio:
Phrase:    17. overcutting Phonics:   Audio:	Phrase:    18. sewage Phonics:   Audio:
Phrase:    19. acid rain Phonics:   Audio:	Phrase:    20. sulphur dioxide Phonics:   Audio:

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