a mesa
A mesa is a small mountain with a wide, flat top.
A flat-topped mountain is a type of mountain with a wide, level summit rather than a pointed peak. These mountains are often formed by erosion or geological processes that result in a plateau-like surface at the top. Examples include Table Mountain in South Africa and the tepuis in Venezuela.
A steep mountain peak due to the flat and open nature of wide valleys.
Option c is correct
This is known as an Alluvial Fan. Please see related links.
old
It is called a side vent.
Texas is generally very flat with wide open spaces. However, there are a number of mountain ranges in Culberson County, Texas.
A wide river valley is called a vale. In Scotland, a wide and flat river valley is also called a strath.
flat rock
I think you mean a plateau. Plateau: expanse of raised land with a level surface. Also known as tableland, do to the flat tops.
A plateau.
Molars
landscape
A volcanic mountain with a wide base and gently sloping sides is called a shield. Shield volcanoes form very large.
A plain or Grassland
lava plateau
There are several types of flat pasta. Fettucini is long, flat, ribbon-shaped, about 1/4" wide. Lasagne is large, flat noodles about 3" wide; usually with curly edges. Linguine is thin, slightly flattened, solid strands, about 1/8" wide.