What are three physical agents that cause weathering of rocks?

The three primary physical weathering agents are temperature changes, water (freeze-thaw action), and wind. Temperature fluctuations cause rocks to expand when heated and contract when cooled; repeated cycles create stress that eventually cracks rocks apart, particularly in desert environments with extreme day-night temperature variations. Water is perhaps the most powerful weathering agent—when it enters rock cracks and freezes, it expands by about 9%, exerting tremendous pressure that fractures the rock. This freeze-thaw cycle is especially effective in mountainous and high-latitude regions. Wind carries abrasive particles that sandblast exposed rock surfaces, gradually wearing them down and shaping distinctive landforms in arid regions. These physical weathering processes break rocks into smaller pieces without changing their chemical composition, creating the raw material for soil formation.