The sheer power of ice can be seen in an American state famous for its sunshine.
With imposing cliffs and deep valleys, Yosemite National Park in California, has a breathtaking landscape.
Yosemite National Park, California
2 million years ago, it looked very different.
It was covered with v-shaped valleys.
Carved out by rivers
During an ice age, glaciers formed in the valleys, great slow-moving rivers of ice.
When the ice retreated it revealed the new, deep u-shaped valleys.
Carved out by glaciers
This process created some of the most spectacular cliff faces on our planet.
Including one that climbers travel from all over the world to scale.
Leo Holding, British Rock Climber – "We call El Cap the 'big daddy'. There's basically no easy way up it, it's the hardest cliff to climb in the world."
910m of vertical rock
When the glacier moved down the valley, it scraped sideways into the rock.
The hard granite was worn away by abrasion.
Wearing down by friction
Grinding the rock with a force of 100kg on every square centimetre.
This created the almost vertical faces that attract the climbers.
Leo Holding, British Rock Climber – "You can see it's so smooth the rock, you hold onto virtually nothing. It's like mother nature created this place for rock climbers."
The steep cliffs are not the only telltale sign that ice helped to reshaped this National Park.
Huge boulders scattered across the landscape are evidence of plucking.
Removal of loose rock by a glacier
These massive rocks would have been carried for kilometres before being deposited.
And hanging valleys show where old river valleys have been cut short by the passing ice.
Cut off by a glacier
Many, creating spectacular waterfalls.
The stunning landscape of Yosemite National Park is a testament to the awesome power of ice, in shaping our world.