填空题

After a thorough investigation of what happens during the earthquake, scientists use ______ to rate the actual damage.

【参考答案】

the Mercalli criteria(scale)

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Ground sea is formed when two plates are sliding toward each other and are tightly pushing together.

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When an earthquake with level 7 in Richter scale rating is reported it means that its amplitude is ______ times stronger than a level 6 earthquake.