Science 9

Rain is water that has managed to get into droplets that have become big enough to fall to earth. The average size of the droplet in a cloud is .001 of a millimeter, however the droplets must be much bigger than that to actually hit the earth. The water is in the cloud and is frozen, if the temperature close to the earth is cold enough then the water will stay frozen and become hail.

Tornadoes occur when dry cold air and warm air mix. The hot air rises fast and the cold air falls fast this causes the air to spin around and around. If the spin gets fast enough then a funnel cloud occurs. The minute the funnel touches the ground then you have a tornado.
The most tornadoes in the world occur in the Tornado alley this occurs in the Mid western United States and parts of Ontario and Quebec. Tornado alley can shift depending on wetter or not there is more hot or cold.

This is a post that is explicitly to show you three types of clouds. The Stratus cloud: the stratuls clouds occur low to the ground. They are flat and and occur from 8000 to 20000ft. The Cumulus cloud: These are fluffy white clouds, sometimes considered happy clouds. These clouds are a sign of good weather. Occur from 8000 to 45000ft. The Cumulonimbus cloud: These are clouds that cause thunderstorms. Commonly produce tense rain and hail. Clouds normally have flat botoms if they do not it is sometimes a harbringer of a tornado. For more information on clouds here are some links: http://schoolscience.rice.edu/duker/weatypeclouds.html

http://www.uen.org/utahlink/weather/clouds/cloud_id.html

This unit in the science curriculum is the study of Weather. The weather occurs in the Atmossphere.