PART 1: https://wxresearch.org/air-mass/ PART 2: https://study.com/learn/lesson/air-masses-types-effects-weather.html PART 3: https://www.e-education.psu.edu/meteo3/l3_p5.html PART 4: http://ww2010.atmos.uiuc.edu/(Gh)/wwhlpr/arctic_airmass_def.rxml?hret=/guides/crclm/act/arms.rxml PART 5: http://ww2010.atmos.uiuc.edu/(Gh)/wwhlpr/tropical_airmass_def.rxml?hret=/guides/crclm/act/arms.rxml PART 6: https://scied.ucar.edu/learning-zone/how-weather-works/weather-fronts PART 7: read this before clicking on the link .... This is a quiz. Once you answer the 1st question, make sure to click on "SUBMIT ANSWER" on the bottom left, NOT "end quiz". When you finish question 15, then it will take you to a screen with a chart showing you which questions you got correct. AT THE BOTTOM OF THAT CHART WILL BE YOUR SCORE. Remember to write your score on your worksheet. https://www.quia.com/quiz/278988.html When you are finished, show it to the teacher ...