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Q.1 (3) કયા સાધનથી ભૂકંપની તીવ્રતા માપી શકાય છે ?
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Q.2 (1) જાપાનનો કયો જ્વાળામુખી પર્વત સુપ્ત જ્વાળામુખી ગણાય છે ?
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Q.3 (2) કયો દેશ જ્વાળામુખીનો ઉપયોગ ભૂ-તાપીય (જીયોથર્મલ) ઊર્જા મેળવવા કરે છે ?