Masterclass crossword

12345678
Across
  1. 1. a colourless, transparent, odourless liquid that forms the seas, lakes, rivers, and rain
  2. 6. conditions relating to public health, especially the provision of clean drinking water and adequate sewage disposal.
  3. 7. the action of delivering letters, parcels, or goods.
  4. 8. a feeling of worry, nervousness, or unease about something with an uncertain outcome
Down
  1. 2. an instrument for measuring and indicating temperature
  2. 3. the action or process of filtering something
  3. 4. a substance used to stimulate immunity to a particular infectious disease or pathogenMan's best friend
  4. 5. a person’s condition with regard to their psychological and emotional well-being
  5. 6. Sustainable Development Goals