Wind, rain, snow, fog, frost, and sunshine are all signs of the constant shifting of the Earth's atmosphere. This continual change given at any time is what we call weather. In general the term weather refers to day-to-day conditions. The weather changes in four main ways–it's movement, which can bring winds; it's temprature, which can cause anything from frosts to heatwaves; it's moisture content, which can bring rain; and it's pressure, which can cause cloudless days or fierce storms. However the when described in Media weather, although meaning any planet, generally refers to the planet Earth.
Weather only occurs in the troposphere, because this layer contains the most water vapor. Without the water vapor, there would be no clouds, no rain or snow – and no weather.
The Weather on Earth contains many variables so each point on the planet has different conditions. Variables like the jet stream, fronts, and the sun all determine what condition is taking place where.
The science of weather
Weather and the atmosphere attracted the attention of thinkers and academics as long ago as the days of ancient Greece. It was the Greek philosopher Aristotle who gave us the word "meteorology" for the scientific study of weather. In the 17th century, in Renaissance Italy, the first instruments were developed to measure changes in the tempreature of the air, its pressure, or weight, and its moisture content. It was in Italy, around 1600, that the great astronomer Galileo Galilei made the first thermometer.
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