The gas used to predict earthquake:

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The gas used to predict earthquake: Answer: Radon

Radon gas is released from underground rocks before an earthquake due to: Cracking of rocks Increased stress in Earth’s crust An abnormal rise in radon concentration in air/groundwater is studied as a possible earthquake precursor.

Question context

This question is part of 🔬 General Science within the broader 🌐 Current Affairs & GK subject and appears in the Engineering College Admission Test (ECAT) preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.