Earthquakes
An earthquake happens when built-up stress along a crack in Earth's crust, called a fault, suddenly releases and shakes the ground. Scientists measure how strong an earthquake is using a magnitude scale, and the Pacific Ring of Fire, the same belt that holds most of the world's active volcanoes, is also where roughly 9 out of every 10 of the world's earthquakes occur.
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This final covers a lot of topics, so it's split into 2 parts. Each part includes a question from every one of its topics.
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