Find out more about the scientific method. Science as defined above is sometimes called pure science to differentiate it from applied science, which is the application of research to human needs. Fields of science are commonly classified along two major lines: 1  Natural sciences, the study of the natural world, and.
In the center a bird rising, and surrounding this the inscription Phoenix, Arizona - Incorporated February 25, 1881.. The first horse-drawn streetcar line was built along some 2 miles of Washington Street in 1887, and the kick off of this new mode of transportation was on Nov. 5.
Overall population density in the Phoenix urbanized area rose substantially in the 1980s. after holding steady in the 1960s and 1970s. It appears that population density continued to. increase during the 1990s. During the 1960s and 1970s, the density of occupied housing units increased.