Occurs where there is a reduction in the gradient of the valley floor, leading to ice deceleration and a thickening of the ice mass. At such points, ice erosion is at its maximum.
Occurs whenthe valley gradient becomes steeper. The ice accelerates and becomes thinner, leading to reduced erosion.
As a glacier moves over bedrock, there will be friction and this, combined with the pressure of overlying ice, results in melting. This meltwater acts as a lubricant , allowing the ice to flow more rapidly
Occurs occasionally when there is a build up of meltwater under a glacier leading to the ice moving formand rapidly, perhaps by 250-300 metres a day
Occurs when ice crystals oriente themselves in the direction of the glacier's movement and slide past each other. As the surface ice moves faster, crevasses develop.
Occurs when stress builds up within a glacier, allowing the ice to behave like plastic and flow. It occurs particually when obstacles are met
Occurs within the corrie. Herer ice moving downhill can pivot about a point, producing rotational movement. This, together with the increased pressure of the ice, leads to greater erosion and over-deepening of the floor.