My answer would be "Earthquakes happen along cracks in the earth's surface, called fault lines, and can be felt over large areas"
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The correct answer would be bones.
X-rays are high energy electromagnetic waves which have an ability to penetrate most of the biological tissues.
In the X-ray machine, a beam of high energy X-rays is passed through the filters and subject and then fall on the detector or photographic film to produce X-ray.
Dense tissues like bone, teeth, tumors et cetera blocks or stops most of the X-ray particles from reaching the detector or photographic film.
It forms glowing pictures on the X-ray film or photographic film.
The denser the material the brighter the image will be formed on the photographic film.
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Explanation:
for example addind electricity helps the community to do more work that would improve the function of the city or addind more factories would increase the production and the economy of the city
