Across
- 3. what the outer core is mostly made from, which means magma must also come from the crust
- 4. literally means 'fragments'
- 8. ash can eventually be helpful to humans because it makes soil more ________
- 11. the chemical that seems to determine how viscous different magma is
- 12. has a high silica content which makes it more viscous
- 13. how far ash can drift because it is small and light
- 14. lava temperature can reach up to 1400 _______
- 17. tephra that had more gas in it leaves holes in the rock, making the rock _______
- 20. larger types of tephra fall _______ to the volcano
Down
- 1. the largest type of tephra ejected from volcanoes
- 2. the tephra type with a large amount of gas bubbles that have escaped
- 5. has an intermediate or medium amount of the chemicals Fe, Mg, Ca, K, Na and silica
- 6. literally means 'fire'
- 7. the runniest type of magma
- 9. all different types of material ejected into the air during an eruption
- 10. the pyroclastic movement that is lighter, faster and far more deadly
- 15. the reason lava is not so dangerous compared to other hazards is because it moves so ______
- 16. the least deadly volcanic hazard
- 18. tephra that hardens to form a denser rock than pumice
- 19. tephra that is smaller than 2mm