**YOU MAY ONLY GO TO THE FOLLOWING WEBSITES. Seriously. Wikipedia is for losers. Don't be a loser.**
Part 1. Air Masses
1. Go to the website: http://www.weatherquestions.com/What_is_an_air_mass.htm to find out what an air mass is.
a. What is an airmass? An airmass is _________________________________________________________
b. What is the difference between a “polar” air mass, and a “tropical” air mass? ________________________
2. Go to the website: http://www.weatherquestions.com/What_causes_high_pressure.htm to find out what causes a high pressure air mass.
a. What causes an air mass to have a high pressure? ______________________________________________
3. The website http://www.weatherquestions.com/What_causes_low_pressure.htm will help you answer the following question:
a. What causes an air mass to have a low pressure? _______________________________________________
4. Look at this picture: http://www.physicalgeography.net/fundamentals/images/thermal2.GIF. Does air move from high pressure to low, or low to high? _______________________________________________________________.
Part 2. Coriolis Effect
5. The Coriolis Effect affects Earth’s winds. Read the information at this website to find out about the Coriolis Effect: http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/fw/crls.rxml . The video at the bottom will give you a visual of the Coriolis Effect.
a. In the video, why does the ball not roll straight across the merry-go-round? __________________________
b. How is the Earth similar to the merry-go-round? (look at the figure) _______________________________
c. What happens to objects in the Northern Hemisphere as a result of the Coriolis Effect? ________________
d. Wind is an object that is affected by the Coriolis Effect. What happens to winds in the Northern Hemisphere as a results of the Coriolis Effect? ________________________________________________________.
6. Use the animation at the following website to help you find out how the Coriolis Effect affects wind:http://www.classzone.com/books/earth_science/terc/content/visualizations/es1905/es1905page01.cfm .
a. Which way does the Coriolis Effect deflect wind in the Northern Hemisphere? _______________________
Part 3. Pressure Centers and Weather
7. Go to the website listed here: http://ww2010.atmos.uiuc.edu/(Gh)/wx/surface.rxml . Then, find the picture that says “Sea Level Pressure with IR satellite”. Click on this figure to bring up a new window. Click on the button that says “Aminate”. Choose “96 frames”. Answer the following questions:
a. This map shows you isobars and cloud cover. What is an isobar? _________________________________
b. Look at the map and find Chicago. Between which two isobars is Chicago? ________________________.
c. Press “Play” on the window, and watch where the clouds travel. Do the clouds tend to be near High pressure centers (H) or Low pressure centers? ________________________________________________________.
8. This last website will help explain why High pressure centers usually mean good weather, and Low pressure centers usually mean bad weather: http://www.usatoday.com/weather/tg/whighlow/whighlow.htm . Go here and read to discover why this is true, and then answer the following questions:
a. Air descends (comes down) at High pressure areas. Why does descending air not allow for clouds to form? ______________________________________________________________________________________________.
b. Air ascends (goes up) at Low pressure areas. Why does ascending air allow for clouds to form? _________
Part 4. Synthesis
Your last task is to synthesize all of the information that you have just learned. You will have two ways to demonstrate your knowledge: a labeled diagram (that you create, not copy from a website), or a written summary of what you have learned. In your diagram or summary, you need to show me that you know the following things: 1) what is an air mass? 2) What happens at a low pressure center, and what happens at a high pressure center? 3) How does the Coriolis Effect affect wind? and, 4) why is good weather associated with high pressure centers, and bad weather with low pressure centers?
Rubric for Part 4:
1. What is an air mass? (3 points)
Student fully demonstrates what an air mass is (3 points)
Student somewhat demonstrates what an air mass is (2 points)
Student does not demonstrate what an air mass is (0 points)
2. Low pressure and high pressure centers (5 points)
Student fully demonstrates what low and high pressure centers are (5 points)
Student somewhat demonstrates what low and high pressure centers are (3 points)
Student does not demonstrate what low and high pressure centers are (0 points)
3. Coriolis Effect (4 points)
Student fully demonstrates what the Coriolis Effect is (4 points)
Student somewhat demonstrates what the Coriolis Effect is (3 points)
Student does not demonstrate what the Coriolis Effect is (0 points)
4. Effect on weather (5 points)
Student fully demonstrates what the effect on weather is (5 points)
Student somewhat demonstrates what the effect on weather is (3 points)
Student does not demonstrate what the effect on weather is (0 points)
5. Neatness and Grammar (3 points)
The summary/diagram is very neat and grammatically correct (3 points)
The summary/diagram is somewhat neat and grammatically correct (2 points)
The summary/diagram is not neat nor grammatically correct (0 points)