• Weather occurs because of unequal heating of the atmosphere.
  • The Sun heats Earth’s surface more in some places than in others.
  • A region's weather depends on its air temperature, air pressure, humidity, precipitation, wind speed and direction, and other factors.
  • In this video by Science Friday, physicist Kenneth Libbrecht shares secrets about snowflakes.
  • The United States is a big country.
  • With two coasts and a large land mass in between, there's a chance for every kind of weather.
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