Random Crossword 2

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Across
  1. 4. Dark volcanic glass
  2. 6. Waterfall or a series of waterfalls
  3. 7. A mystery or puzzle
  4. 8. A long journey, especially by sea
  5. 9. A deep fissure in the earth’s surface
  6. 10. A sign or warning of something to come
Down
  1. 1. A feeling of fear or anxiety about something
  2. 2. Difficult to find, catch, or achieve
  3. 3. Sentimental longing for the past
  4. 5. Isolation to prevent the spread of disease