original_query: What is the relationship between stress and strain in the context of elastic deformation?
query: What is the relationship between stress and strain in the context of elastic deformation?
answer: In elastic deformation, the relationship between stress and strain is linear and reversible;  stress is proportional to strain (Hooke's Law: σ = Eε, where σ is stress, ε is strain, and E is the elastic modulus). When the stress is released, the rock returns to its original shape.