trackimprint |
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navigate by keyword : and backgrounds call characterize computer concave convex curves danger detector diagram drawingactivity earthquake experiment frequency geology graph graphic grid healthcare house ink lie line lined lines magnitudo medicine paper pattern patterns pulse research richter scale scientific seismic seismograph seismology sensor sine single snake symbol symmetry taking technology that trackimprint wallpaper warning wave |
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The lines that characterize the danger scale of an earthquake. |
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