Yosemite Falls is the tallest waterfall in North America with a drop of 2,425 feet (739 m). As water flows in the winter time, small crystals of frozen mist form during the drop and this ice mixes with supercooled water. This forms a very unique (and dangerous) slushy river that behaves like lava or fresh cement!
The following footage is filmed in Yosemite National Park and only gets more incredible as it progresses. Enjoy!