Which of the following is/are direct source(s) of information about the interior of the earth?1. Earthquake wave 2. Volcano 3. Gravitational force 4. Earth magnetism Select the correct answer using the code given below.

Which of the following is/are direct source(s) of information about th

1.	Which of the following is/are direct source(s) of information about the interior of the earth?1. Earthquake wave 2. Volcano 3. Gravitational force 4. Earth magnetism Select the correct answer using the code given below.
Answer» 1.Earthquake waves 2. Volcanoes 3. GRAVITATIONAL force 4. EARTH magnetism Answer :A