| CARBON | Charcoal has a high concentration of this element as well as hydrogen and oxygen (6) |
| NIOBE | Daughter of Tantalus turned into a stone for boasting, whose name was given to a superconductive element as well as an asteroid and a species of fritillary butterfly (5) |
| OXIDANT | Such as hydrogen peroxide or ozone |
| RICHIN | Having a high concentration of |
| COBALT | This element has the chemical symbol Co. A relatively large percentage of the world's production of this metal goes into magnetic alloys such as the Alnicos for permanent magnets. |
| RHOMBI | Figures rocks brim full of hydrogen and oxygen (6) |
| OXYGEN | This element is the most plentiful element in Earth's crust, and it makes up about 21 percent of the atmosphere. Its gaseous form is a critical part of aerobic respiration. |
| AERIAL | It has a high position in the world of radio (6) |
| EUNUCH | Greek character in English university church - he has a high voice (6) |
| GASSES | Hydrogen and oxygen |
| CBD | City's central area with a high concentration of retail and commercial buildings (1,1,1) |
| ACIDRAIN | Precipitation that contains a high concentration of pollutants, chiefly sulphur dioxide and nitrogen oxide |
| STRATHSPEY | Area of Scotland with a high concentration of single malt distilleries |
| IONOSPHERE | Region of the earth's atmosphere in which there is a high concentration of free electrons (10) |
| COPPER | This element was mined in Cyprus during Roman times, and its name means 'from Cyprus' (6) |
| NANTWICH | Cheshire market town with a high concentration of listed buildings |
| IODINE | Core of diode lined using this element |
| OSMOSIS | A process by which solvent molecules move from a region of high concentration to a region of low concentration through a semi permeable membrane (7) |
| NITROGEN | This element makes up about four-fifths of Earth's atmosphere. Plants called legumes can convert the atmospheric form of this element directly into useful compounds. |
| PLATINUM | A very heavy, precious, silver-white metal, this mineral is soft and ductile and has a high melting point and good resistance to corrosion. Compared to other popular precious metals, this mineral is v |
