How The World Works- The Central Idea. Solve the clues to find the words then unjumble them to reaveal this theme's Central Idea!

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Across
  1. 1. Something that is of or produced by nature; not made by humans. (This is an adjective)
  2. 4. A form of the verb "be" which is used with he, she, it, and with singular nouns. You might say "Mr Gleeson ** tall."
  3. 5. Our planet's name.
  4. 7. A group of related things or parts that work together as a whole. For example, "In Science, I was studying the digestive ******." This is the plural form of the word (more than one).
  5. 9. Joined together.
Down
  1. 2. The whole of or every one of.
  2. 3. The time between birth and death.
  3. 6. A determiner. This word is used before a noun when the noun is something specific or already mentioned. "Miss P is *** best teacher in the world".
  4. 8. A determiner. This word is used before a noun when the noun is something specific or already mentioned. "Miss P is *** best teacher in the world".
  5. 10. A two letter word that indicates something. "She was the daughter ** a wealthy man."
  6. 11. A two letter word that links something or gives direction. You might say "I am going ** the toilet."