Summer Camp sheets prim. 4

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Across
  1. 1. Main source of energy on the earth's surface
  2. 4. First organ of digestive system
  3. 6. Energy used to operate electric heater
  4. 8. Liquid renewable resource
Down
  1. 2. First organ of respiratory system
  2. 3. Gaseous renewable resource
  3. 5. Wasted energy when using mobile phone for a long time
  4. 6. is the ability to do work
  5. 7. Energy stored in the battery