| VOLCANO | Vent in the earth's crust |
| SILICON | Second most abundant element in the earth's crust after oxygen, named from the Latin for 'flint' (7) |
| ARSENIC | Poisonous element occurring naturally in the Earth's crust, atomic no. 33 (7) |
| SILICIC | Pertaining to the second most common element in the Earth's crust |
| OUTLETS | Vents in shops? |
| SMOKER | A curer of bacon, cheese, duck or salmon; a user of tobacco; a train carriage or men-only gathering for inhaling or puffing said leaf; a vent in the ocean's floor; or, in apiculture, a beekeeper's pip |
| ASTATINE | The rarest naturally occurring element in the earth's crust |
| OXYGEN | The most abundant element in the Earth's crust (6) |
| SEAWEED | Major source of oxygen in the earth's atmosphere |
| ICEAGES | Glacial periods in the Earth's history (3,4) |
| ALUMINIUM | The most abundant metal in the Earth's crust, atomic number 13 (9) |
| FAULT | Extended fracture in the earth's crust marked by the relative displacement of strata or veins on either side of it (5) |
| TECTONIC | ____ plates, ones in the earth's crust continually shifting in relation to each other (8) |
| ISOSTATIC | One very still, regarding the equilibrium in the earth's crust (9) |
| IRON | Fourth most abundant element in the earth's crust, chiefly occurring in haematite ore (4) |
| SODIUM | Sixth most abundant element in the Earth's crust |
| VOLCANOES | Erupting fissures in the earth's crust (9) |
| FOUNDFAULT | Establish a new crack in the earth's crust? |
| ALUMINUM | Most abundant metal in the earth's crust (8) |
| TECTONICS | Processes in the earth's crust |
