Which is used to determine earthquake risk? A. Hydrogen gas emissions near fractures B. The height of ocean waves C. Changes in the color of rocks near faults D. Strain in rocks near faults

Option D: Strain in rocks near faults

Explanation:

The strain is the change in the shape and size of rock due to the application of applied forces. It is a stressful condition.

When the underground rock suddenly cracks near the fault, Earthquake occurs. In other words, when the rock slips along a fault zone all of a sudden, the energy discharged that makes the earth vibrates causing Earthquake.