Jenna's crossword puzzle <3

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Across
  1. 2. Earth's thinnest layer
  2. 4. Amount of Mass in a given place
  3. 7. Layer of earth made up of crust and upper, solid part of the mantle
  4. 9. One plate sinks down below another plate and forced into the mantle
Down
  1. 1. Organic Matter
  2. 2. The Earths source if heat inside of earth
  3. 3. The thickest layer of earth
  4. 5. Melted Rock Outside of the volcano
  5. 6. "Break It"
  6. 8. A very hard material