It depends on what you're talking about. In the ocean, it is the current but just in general it would typically be rapids.
moving firework
A dolphin is a fast moving animal if you think about it.
A slow moving photon has a longer wavelength compared to a fast moving golf ball. Wavelength is inversely proportional to speed, so the slower the object, the longer the wavelength.
When a cold front is moving quickly and overtaking a warm front, it is referred to as an occluded front. This typically occurs when a fast-moving cold front catches up with a slower-moving warm front, creating a complex weather situation.
It is moving at 4.65 cm per year
The Nile cataract is known as shallow waters in a river. This is usually seen in white or fast moving waters.
The fast moving currents.
Animals adapt to fast-flowing water when their environment is characterized by such waters.
The ocean current Duh
express lane
fast moving
Hooks and Suction cups (yes I know the weirdest answer)
fast
call a doctor or get to the hospital fast
moving fast in Japanese is "subayai"
Fast moving stream
flow is proportional to velocity so its dependent on how fast the waters moving and the size of the pipe... check out the hazen williams nomograph