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