Both can transfer energy through matter, but sound waves travel through air and infrared waves travel through space.
The north american air mass is a large body with generally uniform temperature and humidity. the area from which air mass originates is called source region. the air mass source regions range from extensive snow covered polar areas to deserts to a tropical oceans.
There was a rivalry between the British<span> and </span>French colonists due to the disputes that developed over control over the fur trade, land,<span> and the over balance of power in Europe over the </span>colonies.
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In the early twentieth century, reformers worked to improve American society and ... referred to as the Progressive Era, an era of intense social and political reform aimed at ... During the Progressive Era, protections for workers and consumers were ... who founded Hull House in Chicago to help immigrants adapt to life
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