Magma stored under volcanoes is mostly solid
Analysis of crystals found in lava suggests shift to molten goo occurs close to eruption
![New Zealand volcano](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/06/061517_MT_volcanic-crystals_main_free_2.jpg?fit=860%2C460&ssl=1)
UP AND OUT Seven hundred years ago, a New Zealand volcano (a 19th century eruption is illustrated here) spewed out seven zircon crystals that are providing a peek at the state of magma in underground chambers.
Charles Blomfield