sentences: bottom 24 waves desertification above the oil
docs: desertification is creation_event. ocean_acidification is acidification. desertification is physical_destruction_event. coastal_zone is ocean_stratification_zone. desertification is destruction_event. ocean_stratification_zone is salt_water. ocean_zone is ocean_stratification_zone. euphotic_zone is ocean_stratification_zone. ocean_stratification_zone is layer. ocean_stratification_zone is water.