Waterfalls offer a captivating spectacle of ... safe to travel despite fears The Denmark Strait cataract is naturally formed by differences in water temperature. The strait, which separates ...

75). Yellowstone National Park abounds in waterfalls. But how do they form, and why are there so many in the Yellowstone region? Although there are several definitions for a waterfall, a common ...

Where a river begins Features of a river's upper course How waterfalls, gorges and other physical features are formed Wildlife you might find near or in the upper course This resource is suitable ...