weathering & erosion

• weathering is the breakdown of rocks at the Earth's surface by natural processes
• mechanical weathering is caused by the effects of changing temperature on rocks, causing the rocks to break apart
• Frost wedging is when water enters the cracks of a rocks, freezes, and expands, causing the rock to break
• Salt Crystal Growth is when saltwater comes in the pores of rocks. when it evaporates, salt remains in the pores
• Abrasion - gasgas = deformed rocks
• Biological weathering is the breakdown of rocks by living organisms.
• Chemical weathering caused by slightly acidic water or minerals
• dissolution = crystallization
• oxidation = takla, reddish thingy
• Hydrolysis - clay-like
• Areas that are cold and dry tend to have slow rates of chemical weathering and weathering is mostly physical; chemical weathering is most active in areas with high temperature and rainfall.
• Factors that affect the rate at which weathering takes place

  Climate

  Rock Type

  Rock Structure

  Topography

  Time
• Time

  Length of exposure to agents of weather determines the degree of weathering of a rock
• weathering is focused on abrasion while erosion is more with transportation
• Erosion is the incorporation and transportation of material by a mobile agent such as water, wind, or ice
• Deposition is the geological process in which sediments, soil, and rocks are added to a landform or land mass
• Running water encompasses both overland flow and stream flow
• Discharge is the volume of water passing through a cross-section of a stream during a given time
• Ocean/sea waves caused by wind moving across the surface of water. The friction between the air molecules and the water molecules causes energy
• A glacier is a moving body of ice on land that moves downslope or outward from an area of accumulation
• Wind - the flow of gases on a large scale
• The main erosional process associated with groundwater is solution
• Gravity is responsible for erosion by flowing water and glaciers but also causes erosion directly