Ross Hoddinott / Prince Of Wales engine house, used formally to pump water from the slate quarry, near Trebarwith, Cornwall. UK

Duncan Mcewan / Scrap metal dump in old slate quarry, Isle of Luing, Argyll, Scotland, UK

Theo Bosboom / Colourful slate rock with sand patterns, Playa de las Cathedrales in Galicia, Northwest Spain. November 2017

Theo Bosboom / Slate rock covered with barnacles and Common limpets (Patella vulgata) Playa de las Cathedrales, Galicia, Northwest Spain. November 2016.

Oscar Dewhurst / Andean coot (Fulica ardesiaca) swimming in Lake Titicaca, Puno, Peru. September

Alan Williams / Lake Cwmorthin looking south west showing spoil heaps and ruined cottages of the disused slate mine with pieces of slate covering the bed of the lake in the foreground near Blaenau Ffestiniog, North W...

Alan Williams / Looking east across Lake Cwmorthin showing the remains and spoil from the disused slate mine with Cnicht mountain covered in mist in the background, North Wales, UK, April 2018

Alan Williams / Reflections in Lake Cwmorthin showing pieces of slate from the slate mine below the surface near Blaenau Ffestiniog, North Wales, UK, April 2018.

Alan Williams / Cwmorthin slate mine showing the remains of terraced cottages for the families of the workers near Tanygrisiau and Blaenau Festiniog. North Wales, UK, February 2018.

Matthew Maran / Cheddar cheese on slate board

Thomas Marent / Slate-crowned Antpitta (Grallaricula nana), Rio Blanco Nature Reserve, Colombia

Alan Williams / Slate fence in Cwm Croesor with Cnicht Mountain in background. Snowdonia National Park, Gwynedd, Wales, UK. March 2018.