weather [wind] [3] [comprehension quiz]

It starts with a scientist called Isaac Newton? He named a force gravity. Gravity is a force of attraction between any two masses. In this case air and Earth. When gravity acts on the air, the air exerts a force upon the Earth called atmospheric or air pressure. A millibar is the unit that is used to record that atmospheric or air pressure. Here you can see that in terms of the weather. High Pressure [H] and Low Pressure [L]. These are also know as cyclones and anticyclones. You will need to know about these ready for the weather forcasting section. Here is an animation that shows you how a barometer works. The increase or decrease in air pressure moves the needle around the dial. Here is a real barometer. The dial goes from 28 millibars [stormy weather] right round to 31 millibars [very dry weather].

1. How many millibars would you expect for rain? 30 32 29 2. A Cyclone is another name for? a high pressure area a low pressure area a medium pressure area 3. Which weather would you expect with high pressure? warm and dry cool and wet stormy with rain 4. Who named gravity? Galileo Archimedes Isaac Newton 5. What is gravity? the movement of wind the attraction between two masses high pressure to low pressure

There are 6 pictures in a grid. As you hover over each picture a blue screen appears on which there is some information about what is being shown in the picture. Read this information and look at each picture to make sure you understand what is being shown. If you want to check how much you understand try the quiz on the right hand side. To start the activity again just refresh the page.