erosion
A nearly level area that has been eroded is called a peneplain. It is a landform characterized by extensive, low-relief surfaces that result from prolonged erosion and weathering processes.
a mountain
I think it is called a plateau
it is a plain
A plateau.
Land that is nearly surrounded by water is called a peninsula.
a plateu
peninsula means nearly an island. its called greenwich peninsula because it is nearly an island
The soil in this area was eroded after all the trees were cut.
A large area of level or nearly level land on Earth's surface is called a "plain." Plains can be found in various climates and can be formed through sediment deposition, erosion, or volcanic activity. They are often fertile and suitable for agriculture, making them important for human settlements.
It is called an ulcer
That I believe, would be the Earth's Crust.