Radio is the technology of utilizing radio waves to carry data, such as sound, by regularly changing characteristics of electromagnetic energy waves conveyed through space, such as their amplitude, wavelength, phase, or pulse width. When radio waves hit an electrical wire, the oscillating tracks produce an alternating current in the conductor. The data in the waves can be obtained and converted back into its initial form.
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probably it keeps the soil warm and keeps the remains safe for archaelogists to find them
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The Past Teaches Us About the Present
Because history gives us the tools to analyze and explain problems in the past, it positions us to see patterns that might otherwise be invisible in the present – thus providing a crucial perspective for understanding (and solving!) current and future problems.
The Revolution of 1776-1783 created the United States, the Civil War of 1861-1865 determined what kind of nation it would be. ... Northern victory in the war preserved the United States as one nation and ended the institution of slavery that had divided the country from its beginning