What's in common?

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Across
  1. 2. expanses of salt water
  2. 5. be curious to know something; think about
  3. 7. impressively beautiful, elaborate, striking
  4. 8. outward sign instituted by Christ
  5. 9. a main continuous expanse of land on earth
  6. 10. Snow White's roommates
Down
  1. 1. there are 52 of these in one year
  2. 3. large waterbird with long flexible neck
  3. 4. bringing the universe into existence
  4. 6. arch of color formed in the sky