Crossword

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Across
  1. 1. a guess about what will happen in the future
  2. 3. Changed and developed over time.
  3. 5. Something that can cause danger or harm.
  4. 7. Harmful substances in the air, water, or land.
  5. 9. The first model of a new invention.
Down
  1. 2. The natural world around us.
  2. 4. Taking the place of something or someone.
  3. 6. The air surrounding the Earth.
  4. 8. What is true or real in life, not imagination.