How do hurricanes and cyclones happen?

What is another name for a hurricane or cyclone?
1. typhoon
2. tornado
Hurricanes start when...
1. strong clusters of thunderstorms drift over warm ocean waters
2. strong clusters of thunderstorms drift over cool ocean waters
The warm air from the storm and ocean surface rise and so at the surface we get..
1. low pressure
2. high pressure
Trade winds blowing in opposing directions cause...
1. the storm to start spinning
2. the storm to get worse
The warm air rises so higher up in the sky the pressure gets..
1. lower
2. higher
How long might it take for a fully formed hurricane/cyclone to grow?
1. very quickly - hardly any warning
2. several hours or days
What's it like inside a hurricane?
1. Calm! Low pressure!
2. it is like inside an eye
Look at the scale for measuring hurricanes. How fast (or slow) is the smallest hurricane of category one?
1. 74 miles an hour
2. 95 miles an hour
Move the arrow to the different categories. At which category would you start to get severe flooding?
1. category three
2. right from category one onwards
Cyclone Sidr of November 2007 was designated Category 5... how fast must the winds have been
1. at least 155 mph
2. up to 155 mph