Graham Eaton / Limestone pavement above Malham Cove, Yorkshire

Graham Eaton / The Green Bridge of Wales, a natural rock arch comprising Carboniferous limestone, Castlemartin, Pembrokeshire, Wales. September 2017.

Graham Eaton / The Green Bridge of Wales, a natural rock arch comprising Carboniferous limestone, Castlemartin, Pembrokeshire, Wales. September 2017.

Graham Eaton / A wave-cut platform in Jurassic age, Liassic limestones (Blue Lias). Jointing and erosion patterns can be seen that have contributed to the break-up of the scattered boulders. Southerndown, South Glam...

Graham Eaton / Wave-cut platform in Jurassic age, Liassic limestones (Blue Lias). Jointing and erosion patterns can be seen that have contributed to the break-up of the scattered boulders. Southerndown, South Glamor...

Graham Eaton / Wave cut notch at the base of a sea cliff, Burton Bradstock, Dorset, UK. The notch is eroded at beach level in cliffs of Jurassic, Bridport Sandstone. The notch will grow to a depth where the overlyin...

Graham Eaton / A glacial erratic of Silurian age sandstone, perched upon younger Carboniferous age limestones. The limestone forms a limestone pavement with the hill , Whernside, Yorkshire, England, UK.

Graham Eaton / Glacial erratic of Silurian age sandstone, perched upon youger Carboniferous age limestones. The limestones form a limestone pavement with the hill Ingleborough in the background. Whernside, Yorkshire...

Graham Eaton / Roche moutonnee or Sheep's back at the head, Nant Ffrancon Valley, Snowdonia, Wales, UK, November. The rock is carved by ice moving down the valley leaving a relatively smooth back edge and top, w...

Ashley Cooper / China Clay workings, near St Austell, in Cornwall, England, UK, April.

Ashley Cooper / Stone stripes on Coniston Old Man in the Lake district, UK. These patterned ground features are caused by freeze thaw cycles which heaves the larger stones into lines down slope. January 2012

Ashley Cooper / Clear water from Dettifoss waterfall mixing with glacial meltwater of River Jokulsa a Fjollum from the Vatnajokull ice sheet. Iceland, September 2010