Which of the following is/are matched correctly? 1. Earthquake's origin - seismic focus 2. Epicentre - point on earth's surface directly above seismic focus 3. S waves - similar to sound waves 4. Richter scale - severity of earthquake

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1, 2, 3 and 4

Which of the following is/are matched correctly? 1. Earthquake's origin - seismic focus 2. Epicentre - point on earth's surface directly above seismic focus 3. S waves - similar to sound waves 4. Richter scale - severity of earthquake

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