Ice is one of the strangest, most beguiling and mesmerising substances in the world. Full of contradictions, it is transparent yet it can glow with colour, it is powerful enough to shatter rock but it can melt in the blink of an eye.
It takes many shapes, from the fleeting beauty of a snowflake to the multi-million tonne vastness of a glacier and the eeriness of the ice fountains of far-flung moons.
Dr. Gabrielle Walker of BBC Earth Lab captured a gorgeous timelapse footage of a glacier as it moved downhill, flowing like a river through a frozen valley. Dr. Walker also explained how glaciers are able to move, what forms they take and what exactly keeps them moving.