| 11. | Rivers of fire cascade down the mountainside, 2, 100 degrees of molten rock.
|
| 12. | This molten rock magma then cools and crystallizes, forming igneous rocks.
|
| 13. | But it's more than molten rock that makes a volcano dangerous.
|
| 14. | Some theorists think it is essentially a huge, largely molten rock.
|
| 15. | Underlying the volcano is a massive layer of molten rock.
|
| 16. | In 1947, 11 mountaineers were killed there when they were struck by molten rocks.
|
| 17. | Beneath the surface, great masses of molten rock were injected and hardened in place.
|
| 18. | The molten rock, with or without suspended crystals and gas bubbles, is called magma.
|
| 19. | In reality, molten rock is only part of the problem.
|
| 20. | These days the pulses of molten rock are coming every 12 to 18 hours.
|
