The valley have steep sides because soil and loose rocks are washed downhill after a heavy rainfall. The soil and rock also create a load in the river.
They are canyons
young
Mountains are large steep hills pretty much just bigger and valleys are A low area of land between hills or mountains, typically with a river or stream flowing through it.
A canyon is a deep valley with steep sides, think of the grand canyon most famously to visualise what this is. A gorge is a deep ravine, which usually has a river running through it - though this doesn't have to be the case. Finally a valley is any depression, usually of a certain length, in the surface of the land and often contains a river. So, a canyon is a specific type of valley, with particularly steep sides. A gorge is a particularly deep depression, and will usually contain a river.
Moving water causes valleys to have a V shape. In mountain ranges, rivers have steep gradients so their is no additional erosion to the mountain shape.
Platue
there are no such things only V shaped valleys which have sides sloping down to a river that has cut the valley out of the rock and U shaped valleys with flat bottoms and steep sides. these have been carved out by glaciers
Vales or Glens
Vales or Glens
They are canyons
a deep, steep-sided, narrow river valley
young
the river running through rock wear it down into deep valley with the steep sides what is it called
A steep valley is called a canyon or ravine. Valleys can have different shapes because of the shape of the land and what is eroding it. The canyons usually have steep sides. Other words that can refer to a steep valley include gully, hollow and gorge.
A Canyon
A young mountain has steep sides. It also has sharp jagged peaks and narrow valleys. Older mountains are more rounded.
A narrow valley is a V-shaped valley, or river valley. A narrow valley has steep sloped sides that look like the letter V. They are formed by a strong stream.