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Choose the suitable word for the blank by clicking the correct answer.
(this is an easy one) A _____ is an equipment used to record the strength, duration and distance away of earthquakes.
_____ quakes are one of the general class of earthquakes which pose particular problems for scientists trying to develop ways to predict them.
There will be a great disturbance under an ocean as an strong earthquake occurs or a volcano erupts. As a result, a _____ is formed.
A Chinese astronomer called _____ invented the oldest seismoscope.
Seismologists have found that major earthquakes are often preceded by certain measurable physical changes in the environment around the _____.
_____, a scale that measures the energy released at the focus of a quake.
The unit that is used to measure the greatness of an earthquake is called _____.
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last updated: 17/08/99¡C