the river running through rock wear it down into deep valley with the steep sides what is it called
Canyon
A stream.
On the outside. This is because when the water is flowing around a meander, the water practically goes around, where erosion occurs. If you know science, wherever in a stream where erosion occurs, thats where the velocity is greatest.
Water will flow downhill. Weeds often grow and lean downstream. Ripples and floating debris will show flow direction.
So you can see the sun stream through the window, Messiah was born,
Try "canyon".
Canyon
A long, narrow valley between high cliffs is a canyon. Canyons within mountains, or gorges that have an opening on only one side are called box canyons. Slot canyons are very narrow canyons, often with smooth walls.
A wide stream valley has gently sloping sides and a broad, flat floor due to erosion over time by a large volume of water. In contrast, a narrow stream valley has steep, V-shaped sides and a narrow floor formed by fast-flowing water cutting through the landscape.
A flowing water that is confined to a narrow depression in the Earth is called a stream or a creek. These water bodies typically have defined channels that carry water downstream due to gravity.
Some prominent features of a narrow V-shaped valley with a stream profile that drops rapidly include steep, rocky walls, minimal vegetation due to the harsh environment, a high-gradient stream flowing through the valley, and the potential for waterfalls and cascades as the stream descends quickly.
Ravine: A deep, narrow gorge with steep sides formed by erosion from a stream or river.
Jet streams are fast flowing, narrow air currents found in the atmospheres of some planets, including Earth.
A Gorge
stream discharge is the amount of water flowing through a space OR increases between its source or mouth
A river, or stream.
The jet stream is located in the tropopause, which is the boundary between the troposphere and the stratosphere. It is a fast-flowing, narrow air current that moves from west to east at high altitudes.