Urbanisation.
Rural-urban migration
philadelphians
New Orleans, Camden, Detroit, Baltimore, Memphis, and St. Louis seem to be the worst. Other cities known for a high murder rate are Philadelphia, D.C, L.A, are parts of New York such as the Bronx and Brooklyn. It's important to remember that only parts of these cities are warzones, and that there are decent areas in all of them.
Probably because, in the US for instance) with over 300 million people and people moving in and out of employment, its hard to keep accurate records. The only really known figures are those drawing unemployment benefits. The rest can only be guessed and government statisticians would rather be accurate than have guesstimates.
Everywhere. There is no magical, hidden place or island of lesbians.San Francisco in California is well known for it's high gay population.San Francisco is just one place that has a high population of gay people. There are many other cities like Chicago, Seattle, NYC, Atlanta etc.
Ethnic group.
That's the phenomenon of Plate Tectonics part of which is Continental Drift. Very important when understanding geological events.
The Doppler Effect See related link
A phenomenon is a fact or situation that is observed to exist or happen, especially one whose cause or explanation is in question. It is often used to describe something remarkable or unusual that is observed or experienced. Examples include natural occurrences like rainbows or auroras, as well as societal phenomena like trends or fads.
Light, which travels at ~186,000 miles/second is the fastest known natural phenomenon.
The weather phenomenon is known as El Nino.
acoustic resonance
Michael Faraday was the first one who observed the production of electricity by moving magnets towards a coil of wire. This phenomenon is known as electromagnetic induction.
Urbanization is the movement from rural area to cities. In the 1920's there were over 65 cities with more than 100,000 people. Two million people a year were leaving there farms and moving to cities. City people were more open to new ideas in art, science and politics. Most people who supported prohibition were rural white folk- and in cities, organized crime took off- famous criminals like Al Capone rose and places like Chicago became known for their crime.
Urbanization is the movement from rural area to cities. In the 1920's there were over 65 cities with more than 100,000 people. Two million people a year were leaving there farms and moving to cities. City people were more open to new ideas in art, science and politics. Most people who supported prohibition were rural white folk- and in cities, organized crime took off- famous criminals like Al Capone rose and places like Chicago became known for their crime.
Light
There were millions of buffaloes in the west. the Transcontinental railroad was just created. In the eastern cities people needed food. cowboys, also known as cowhands and vaqueros would move them from as low as Texas to the railroad to ship them to the eastern cities.
Probable the phenomenon is known from the prehistory.