There are four main parts to a sound wave: wavelength, period, amplitude, and frequency.
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10 unfamilliar words: mundane,susceptible,adept,comely,pensive,contrive,derision,osentatious,vehement,and compel
An element is the simplest form of matter that cannot be split into simpler substances or built from simpler substances by any ordinary chemical or physical method. There are 110 elements known to us, out of which 92 are naturally occurring, while the rest have been prepared artificially. Elements are further classified into metals, non-metals, and metalloids.