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Earth Facts

The bulk of the Earth is made from iron, oxygen, magnesium and silicon. More than 80 chemical elements occur naturally in the Earth and its atmosphere. The crust is made mostly from oxygen and silicon, with aluminum, iron, calcium, magnesium, sodium, potassium, titanium and traces of 64 other elements. The upper mantle is made up…
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Earthquake Facts

Many major cities are located in earthquake zones, such as Los Angeles, Mexico City and Tokyo. Severe earthquakes can collapse buildings and rip up flyovers. When freeways collapsed in the 1989 San Francisco quake, some cars were crushed to 0.5 m thick. The 1906 earthquake in San Francisco destroyed 400 km of railway track around…
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