Review 6th grade science HW

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Across
  1. 6. this layer of the earth is made up of mostly iron and nickel
  2. 8. what type of factor is completing plants
  3. 10. when plants don't grow until they have the right conditions
  4. 12. this layer of the earth is made up of continental and oceanic plates
  5. 16. the part of the Electromagnetic spectrum that we can see
Down
  1. 1. waves that have crest and troughs
  2. 2. what type of factor is rainfall
  3. 3. the largest component of the soil
  4. 4. A current which causes the plates to move
  5. 5. waves that have compression and rarefactions
  6. 7. produces and stores pollen
  7. 9. soil type which has the best water retention
  8. 11. This is created when plates are pushed together
  9. 13. sound waves travel ___________ in air than solid because the particles are far apart
  10. 14. waves transmit ______________
  11. 15. to grow plants in soil you must know how much _______ the soil can hold