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Unit 03 Weather
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Unit 03 Weather

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  • 1. Unit 3: Weather and Climate
  • 2. Ciencias Sociales Bilingual Section of 1º E.S.O I.E.S. Guadiana Weather and Climate The weather is the situation of the atmosphere during a short period (a day or shorter), and a small surface of the Earth (a city , for example). It is very irregular and changes a lot. The climate is the situation of the atmo- sphere during a long period of time and a big surface. The elements of the climate The climate has these elements: temperature, rainfall, pressure, and wind. We can measure these elements. The temperature: We measure the atmospheric temperature with a thermometer in Celsius degrees (ºC). The temperature of a place changes with the latitude. 2
  • 3. Ciencias Sociales Bilingual Section of 1º E.S.O I.E.S. Guadiana According to temperatures, the Earth is divided in five zones: • One hot zone, located between the tropics • Two temperate zones, located between the poles and the tropics. • Two cold zones, that are located in the Artic Pole and the Antarc- tic Pole. 3
  • 4. Ciencias Sociales Bilingual Section of 1º E.S.O I.E.S. Guadiana The temperature is how hot or cold something is, for example the atmosphere. Use a thermometer to see how many degrees Celsius/centigrade it is above or below freezing (0ºC). To be able to identify a climate you need to describe the temperature of the hottest and de coldest months and the temperature range. Rain Precipitation occurs when so much water has condensed that the air cannot hold it. The clouds get heavy and water falls back to the earth in the form of rain, hail, sleet or snow. We need a rain gauge to measure precipitations. It shows (in millimetres) the quantity of water fallen during a period of time: a day, a month… 4
  • 5. Ciencias Sociales Bilingual Section of 1º E.S.O I.E.S. Guadiana Precipitation is the moisture that falls from the air to the ground. The most common form of precipitation is rain snow or hail. To identify a climate you also need to describe the total amount of annual rainfall that is how many millimetres fall in a year. Pressure Atmospheric pressure (or air pressure) is the weight of air on the earth's surface.We measure pressure with a barometer. Meteorologists use the milibar as a unit of measure. The atmospheric pressure depends on air temperature and altitude.The average air pressure at sea level is 1013 mb. When pressure is higher than 1013 mb in a certain area of the Earth, it is called a high pressure. If it is lower than 1013 mb, it is called low pressure. We show pressure on a weather map with lines called isobars. Isobars match points with equal pressure. 5
  • 6. Ciencias Sociales Bilingual Section of 1º E.S.O I.E.S. Guadiana THE WIND Wind is air in motion. Two factors are necessary to specify wind: speed and direction. We measure the speed of the wind with an anemomet- er. 6
  • 7. Ciencias Sociales Bilingual Section of 1º E.S.O I.E.S. Guadiana EXERCISES CLIMOGRAPH 1 A climograph shows the temperatures (line ) and the amount of precipitation (bars ) for the months of one year. 1. Work in pairs. Look at the climograph and make sentences: The X axis the months of the year The Y axis on the left represents temperature in ºC The Y axis on the right shows precipitation in mm 2. Look at the climograph and answer the questions a) What is the temperature in May? b) What is the amount of precipitation in December? c) What is the hottest month? d) What is the coldest month? e) What is the wettest month? f) What is the driest month? 7
  • 8. Ciencias Sociales Bilingual Section of 1º E.S.O I.E.S. Guadiana g) The data in the climograph is taken from which hemisphere? 3. Work in pairs. Write 4 characteristics of this climate. CLIMOGRAPH 2 1. __________________________________________________ 2. __________________________________________________ 3. __________________________________________________ 4. __________________________________________________ VOCABULARY 8
  • 9. Ciencias Sociales Bilingual Section of 1º E.S.O I.E.S. Guadiana Weather Thermometer Climate Anemometer Rainfall Barometer Pressure Precipitation Temperature Rain gauge Wind Condense Measure Amount Degree Hail Poles Average Tropics Range Sea level Speed Isobar Climograph Above Axis Below Data 9