Planet Earth is estimated to be about four-and-a-half billion years old, and in that time, tectonic plates have shifted, oceans have ebbed and flowed, and roaring volcanoes have erupted, creating so much of our modern topography. From towering rock formations to stunningly colorful landscapes, these formations showcase the power and beauty of the Earth's geological processes. Join us for today's video, as we count-down the 15 most amazing geological formations!