| OROGENY | Formation of mountains |
| OROGEN | Geological belt in Earth's crust involved with the formation of mountains (6) |
| RIFT | Formation of mountain |
| PHALANX | A formation of ancient Greek warriors with interlocking shields; or, by extension, a dense body of soldiers; a crowd; a bone of a finger or toe; or, a bundle of stamens (7) |
| LAYOUT | The arrangement or plan of something ; the format of a printed page; a formation of cards in patience; or, a configuration of dominoes (6) |
| AMITOSIS | The direct method of cell division characterized by simple division of the nucleus without formation of chromosomes. |
| HAHN | Kurt ___; founder of Gordonstoun and Outward Bound who was key in the formation of the Duke of Edinburgh's Award Scheme (4) |
| RAIN | Believed to fall in the form of diamonds on Saturn and Jupiter, precipitation involved in the formation of opals and phenomena in the form of spectral arcs (4) |
| NEEDLES | Formation of chalk stacks off the west coast of the Isle of Wight |
| STARBURSTS | Patterns of lines radiating from light sources; or, periods of intense galactic activity involving the formation of stellar objects (10) |
| ONOMATOPOEIA | Formation of a word by imitation of the sound of what it describes (12) |
| SEAFLOORSPREADING | Formation of new areas of oceanic crust |
| CANADA | ___ Day (July 1 observance north of the U.S. commemorating the formation of the Dominion) |
| LOCKSTEP | Formation of troops moving forward on part of flight (8) |
| MILKYWAY | Boatman's type taken in on method of formation of stars (5,3) |
| VOODOO | Magic formation of flying geese died, swallowed by a number of ducks (6) |
| REVOLUTION | Series of events in 1917 that led to the formation of the USSR, the Russian ... |
| BEVAN | Aneurin ---, Welsh Labour politician who was the Minister of Health responsible for the formation of the NHS (5) |
| SKEIN | Loosely-tied coil of yarn/wool; or, a formation of geese in flight (5) |
| BROWNSEA | --- Island, Dorset location of a 1907 camp that led to the formation of the Scout movement (8) |
