deep valley i think :)
A polygon with 3 sides is called triangle A polygon with 4 sides is called quadrilateral A polygon with 5 sides is called pentagon A polygon with 6 sides is called hexagon A polygon with 7 sides is called heptagon A polygon with 8 sides is called octagon
The nonparallel sides of a trapezoid are called the legs. The parallel sides are called the bases.
A polygon with 7 sides is called a heptagon.
The two sides of a coin are called head and tail.
The legs or transverse sides.
Valley
A deep valley with steep sides would be called a gorge or canyon.
the river running through rock wear it down into deep valley with the steep sides what is it called
- Chasm - Canyon - Ravine - Gorge
Canyon
Such structure could be called a Canyon.
Canyon
These are called Ocean ridges. The most noted one is the mid-atlantic ridge.
fjord
A deep valley could be called a canyon, such as the Grand Canyon.
That would be CANYON.
Rift valley