The floor is lava

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Across
  1. 1. a dark colored rock formed by the rapid cooling of lava
  2. 4. strike or hit (someone or something) very hard.
  3. 6. a person or thing seen as comparable to another
  4. 8. end of existence; death
  5. 11. an expert at dating rock formations and geological events
Down
  1. 2. a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake
  2. 3. a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust.
  3. 5. seeming reasonable or probable.
  4. 7. angry and bitter
  5. 9. to adjust; to take external factors into consideration or to allow comparison with other data
  6. 10. the arrangement of dates or events in the order of their occurrences