(uplifting music)
F1: This is the top of Pen-y-Fan,
a mountain at the heart of the Brecon Beacons National Park.
Only 11,000 years ago, the valleys around this mountain
were filled with ice from glaciers
that dominated this landscape.
Pen-y-Fan is a landform known as a pyramid peak,
where the heads of three or more
glacial valleys come together.
This is a pyramid peak called Cribyn,
and beneath Cribyn is a corrie and U-shaped valley,
another corrie and a U-shaped valley
and another corrie and a U-shaped valley.
And glaciers within these three valleys
will have carved away at the mountain,
creating this beautiful pointed summit.
In mountain ranges where glaciers are still at work,
these pointed summits are much sharper
and more spectacular.
For example, the Matterhorn in Switzerland
or even Mount Everest in the Himalayas.