The instrument that records and measures the seismic waves during an earthquake is a seismograph. It uses the vibration propagated by from the earthquake source's energy. It mainly uses a suspended pen that records the motion between itself and the paper film.
779 million km exact number is 778,547,200 km.
It is D because it involves rocks moving.
1. True
2. True
3. True
4. True
5. True
6. True
7. False
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