weathering and erosion

• Erosion is the movement or removal of rock fragments by wind, water, ice, or gravity.
• Weathering is the breakdown of rocks into smaller pieces without moving them.
• weathering of glaciers is a process whereby the glacier erodes the rock
• glacial erosion occurs when the weight of the glacier causes it to crush and grind against the bedrock below
• Plucking is process of erosion that occcus during glaciation As ice and glaciers move, they scrape along the surrounding rock and pull away pieces of rock which causes erosion.
• abrasion is caused by the friction between the rock surface and the sediment carried within the glacier
• a tarn is a lake formed in a corrie
• a corrie is a steep sided valley that is formed by glaciers
• a hanging valley is formed by deep erosion of glaciers
• truncated spur is are landforms that occur in glaciated areas where the glacier has retreated
• Moraines are formed by glacial meltwater and debris carried by glaciers.
• A terminal moraine is a ridge of material deposited at the end of a glacier
• plucking creates a steep back wall and abrasion further deepens the hollow where the corrie is created
• An arête is knife edge ridge formed when two Corries are back to back
• a pyramidal peak is formed when 3 or 4 corries meet around a mountain
• landform is something that forms over land
• A cirque is a bowl shaped depression at the head of a valley, it has been carved out by glacial action
• The cirque is made up of a U-shaped valley with a flat floor and steep sides
• A large glacier eroded thought the v shaped valley creating it into a u shapwd valley
• two main types of erosion are plucking and abrasian
• abrasion is where rock fragments carried along by the glaciers rub against the surface of the bedrock causing it to wear down
• plucking is where ice picks up rocks from the bedrock below and carries them away