| GEOLOGICAL | Of the Earth's structure (10) |
| TECTONIC | Of the movement of the earth's structure (8) |
| GEOLOGY | Study of the Earth's structure |
| GEOLOGIST | Scientist of the earth's structure (9) |
| RIFTVALLEY | Elongated trough formed by the subsidence of a segment of the Earth's crust along a fault (4,6) |
| IONOSPHERE | Layer of the earth's atmosphere that lies above the mesosphere (10) |
| OZONELAYER | Thin part of the earth's atmosphere which absorbs most of the sun's ultraviolet radiation (5,5) |
| GEOPHYSICS | Study of the Earth's properties (10) |
| SPACECRAFT | Vehicle for travelling outside of the Earth's atmosphere (10) |
| TERRAFIRMA | Solid part of the earth's surface (5,5) |
| RENEWABLE | Harvesting the power of sunlight, the high temperatures of the earth's crust, the wind or waves; ... |
| GREENHOUSEEFFECT | The warming up of the earth's surface through the trapping of solar radiation by carbon dioxide from burning fossil fuels (10,6) |
| PHYSICALGEOGRAPHY | The study of the natural features of the earth's surface (8,9) |
| MANTLE | Part of the earth's interior lying between the crust and the core, believed to consist chiefly of silicate rock (6) |
| ASIA | Containing 48 countries and covering some 30 per cent of the Earth's land area, the largest of the world's continents (4) |
| BRADLEY | Edmond Halley's successor as Astronomer Royal who discovered the aberration of starlight and the nutation of the Earth's axis (7) |
| EQUINOX | Name the time when the sun crosses the plane of the earth's equator (7) |
| POLARIS | Situated where the projection of the Earth's axis or the NCP lies, the current North Star, used to determine latitude and formerly by sailors for navigation (7) |
| PARSEC | Distance at which the mean radius of the earth's orbit subtends an angle of one second of arc (6) |
| DESERT | Around 20 percent of the Earth's land surface is in the form of this arid landscape |
