Fire, farming and wheel

1234567
Across
  1. 1. to become aware of
  2. 2. extra ordinary
  3. 5. the first discovery of early humans
  4. 6. the process of discovering something
Down
  1. 1. People travelling from one place to another
  2. 3. cooked
  3. 4. to dig the soil
  4. 7. a small burning piece of fire which flies out from something that is burning