Answer
Joints promote weathering by providing pathways for water, gases, and other agents of weathering to penetrate into rocks. The presence of joints creates increased surface area and weakens the rock, making it more susceptible to the processes of weathering. Water can seep into the joints and exert pressure on the rock, causing it to expand and contract during freeze-thaw cycles, leading to mechanical weathering. Additionally, joints can facilitate the infiltration of chemical agents, such as acidic rainwater, which can chemically react with the minerals within the rock, leading to chemical weathering. Overall, joints enhance the accessibility of weathering agents, accelerating the breakdown and decomposition of rocks.
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