Oral complications caused by radiation therapy to the head and neck include the following: Fibrosis (growth of fibrous tissue) in the mucous membrane in the mouth. Tooth decay and gum disease. Breakdown of tissue in the area that receives radiation. Breakdown of bone in the area that receives radiation.
A landform is any natural formation of rock and dirt, found on Earth. A landform can be as large as a mountain range, or as small as a hill. It can be as large as a continent, or as small as a pond.
Landforms are formed by movements of the earth, such as earthquakes, weathering, erosions and deposits. Many landforms are created by more than one of these processes. These are called polygenetic landforms. Structural landforms are created through plate tectonics.