| A | B |
|---|
| AA | LAVA WITH A BROKEN BOULDERY SURFACE |
| ASH | POWDERY MATERIAL THROWN OUT OF A VOLCANO |
| CALDERA | THE COLLAPSED CONE OF A VOLCANO |
| CORE | THE INNERMOST PART OF THE EARTH |
| CRUST | THE THE OUTERMOST LAYER OF THE EARTH |
| FISSURE | A CRACK IN A ROCK |
| LAVA | MOLTEN ROCK FLOWING ACROSS THE EARTH'S SURFACE |
| MANTLE | LAYER OF THE EARTH BETWEEN THE CRUST & THE CORE |
| PAHOEHOE | LAVA THAT HAS A SMOOTH SURFACE |
| MAGMA | MOLTEN MATERIAL THAT RISES FROM THE MANTLE |
| VENT | VERTICAL PIPE THAT ALLOWS THE PASSAGE OF MAGMA THROUGH THE VOLCANO |
| ERUPTION | SUDDEN OUTPOURING FROM A VOLCANO |
| EARTHQUAKE | SHAKING OF THE EARTH'S SURFACE |
| RICHTER SCALE | SYSTEM USED TO MEASURE THE STRENGTH OF AN EARTHQUAKE |
| FOCUS | THE ORIGIN OF AN EARTHQUAKE |
| EPICENTRE | THE EARTH'S SURFACE ABOVE THE FOCUS |
| AFTERSHOCK | EARTHQUAKE THAT FOLLOWS THE MAIN SHOCK |
| DORMANT | A VOLCANO WHICH SHOWS NO SIGNS OF ACTIVITY, BUT HAS IN THE RECENT PAST |
| IGNEOUS ROCK | ROCK FORMED BY THE SOLIDIFICATION OF MAGMA |
| GEYSER | FOUNTAIN OF HOT WATER THAT RISES FROM ROCKS HEATED BY DORMANT VOLCANOES |
