Rapids

section of a river where the river bed is relatively steep, increasing the water's velocity and turbulence
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Rapids are found on rivers. Rapids are formed by one or more of the following: constriction, obstruction, gradient, and flow rate. For instance, when water is flowing swiftly over a rocky river bed, rapids can be formed. Rapids are typically found in or near the mountains, due to the element of gradient. Formally, the word "rapids" is always plural, (like "scissors" and "trousers"), but is often used in the singular when speaking of a specific rapid or when it would be grammatically awkward; e.g., "Sweet's Falls Rapids vs. Sweet's Falls Rapid). The word "rapid" means "very fast."

The Lavittakoski Rapids in Finland

Because of the splash made by the water going over rocks, rapids are also called "whitewater". Some people enjoying whitewater canoeing or whitewater rafting as a sport.

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