What is the name for water turning into water vapour? What is the name for water turning from a gas into a liquid? What is the name for rainfall, sleet,

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Presentation transcript:

What is the name for water turning into water vapour? What is the name for water turning from a gas into a liquid? What is the name for rainfall, sleet, hail and snow? Key Words

The Three Causes of Rain By the end of the lesson you will be able to… Identify the three different types of rain Investigate the causes for different types of rain. Identify the types of rainfall found in UK regions

Click me!! Animation Rainfall Link Rainfall Movie Link

The Three Causes of Rain Convectional 1 - The sun is the driving force behind the process of convection which is the main process behind the creation of rain. 2 - The sun heats up the ground and this in turn heats up the air. The sun cannot directly heat the air. When the water is heated, it turns to water vapour – a gas! 3 - As the air is warm, it rises up into the atmosphere, taking the water vapour with it. As it does so, it cools as it gets further away from its heat source (the sea). 4 - Eventually, the air and vapour cool to the point where the vapour (gas) condenses, making it visible as clouds. 5 - Water droplets within the clouds collide and join together to form rain drops, which fall back down to the sea / ground.

The Three Causes of Rain Relief / Orographic Rain 1 - Air is forced to rise over a hill or mountain. As air rises away from the heat source (the ground heated up by the sun) the air cools by 1°C per 100m. 2 - As the water vapour in the air condenses, it forms clouds and rains. Air that has cooled cannot hold as much water as warmer air. 3 - The air starts to descend the hill or mountain and begins to warm up again. 4 - As air warms up, it can hold more water and as it has precipitated, the air has less water overall. Therefore clouds disappear and rain stops. This side of the relief feature is known as a RAINSHADOW.

The Three Causes of Rain Frontal / Cyclonic Rain 1 - The colder air mass is more dense than the warmer air mass, so carries on pushing forward along the ground. 2 - The warmer air mass is lighter than the colder one so is forced to rise over the advancing cold air mass. 3 - As the air is forced to rise, it cools and water vapour in the air condenses to form clouds. 4 - Further forcing of the air (now with clouds) upwards causes precipitation to occur.

QUESTIONS 1.What is a front? 2.How is frontal rain caused? 3.Name the three types of rainfall? 4.Yorkshire is often in a rain shadow. What does this mean? 5.What direction does most of Britain’s rain come from? 6.Explain why we can say all rainfall is formed in the same way but have three different types of rainfall?

QUESTIONS 7.Explain how Relief rain is formed? 8.Why does convectional rain often happen in summer? 9.Explain how convectional rain is formed? 10.At what height do clouds begin to form in this type of rainfall? 11.How high can these clouds go up to in the atmosphere?