Prefix intro and sub

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Across
  1. 1. to examine your own thoughts or feelings
  2. 2. someone who doesn’t like big crowds
  3. 3. the sum of part of a series of figures
  4. 4. to completely go under the water
  5. 5. something that is designed to enter or be inserted into another body or object
  6. 7. telling someone you just met who you are
Down
  1. 1. To bend or flex inwards
  2. 3. a big machine that travels under the water
  3. 4. based on or influenced by personal feelings, tastes, or opinions.
  4. 6. an area just beyond a city’s border