1. Water and Weather Unit Week 13 Directions 1.Prepare your desk for science. Leave worksheet pg. 56A & 57A on top of your desk. 2.Use voice level 0 (no voice) to read textbook pg. 188-189. Think about the air pressure in Earth’s atmosphere.

2. Targets & Warm Up Targets: Students will discover how and why water changes state. Students will identify two types of fronts and the weather changes that they bring. Warm Up: What is low pressure? What is high pressure? How do they happen? What type of weather can you expect for each one?

3. Air Pressure Review

4. Air particles move further apart Air rises Area of low pressure forms Air particles move closer together Air sinks Area of high pressure forms

5. Air Pressure Video Gravity and Air Pressure

6. Homework Review Worksheet pg. 56A & 57A

7. Experiment Day 2 (Data from Miss Pien)

8. Experiment Day 3

9. Table of Contents DateTitlePage Fronts41 Once you are finished with the Table of Contents, go to page 41 and add the title and date to the top of the page.

10. StudyJams: Air Masses and Fronts http://studyjams.scholastic.com/studyjams/jam s/science/weather-and-climate/air-masses- and-fronts.htm

11. Air Masses & Humidity Air mass: A huge body of air that has nearly the same temperature and humidity. Forms over a large area of land or water Humidity: the amount of water vapor in the air

12. Air Masses Polar Areas (cool/cold air masses) Tropical Areas (warm/hot air masses)

13. Air Mass Has water vapor that evaporates from the land or water below it Air masses over the water have greater humidity than those that from over land Warm ocean = warm and humid air mass Cool ocean = cool and humid air mass

14. Air Mass Polar Areas (cool/cold air masses) Tropical Areas (warm/hot air masses) Humid Dry

15. Where would you see each type of air mass? Cold, dry Hot, dry Cold, wet Hot, wet

16. Tracking Air Masses The way air masses move and interact cause most weather As an air mass moves, it takes its temperature and humidity to another place Scientists predict weather by tracking air masses Weather is the result of how air, water, and temperature interact

17. Front Area where two air masses meet Two types: cold front & warm front

18. Cold Front How It Forms: A moving cold air mass bumps into a warm air mass The cold air sinks under the warm air The warm air cools as it pushes upward Water vapor condenses into clouds Weather It Brings: Colder temperatures Strong winds Short, heavy precipitation Thunderstorms

19. Cold Front Animation http://www.phschool.com/atschool/phsciexp/active_ar t/weather_fronts/

20. Warm Front How It Forms: A warm air mass runs into a cold air mass that is moving slowly Warm air moves forward and cools Water vapor condenses into clouds Move more slowly than cold fronts Weather It Brings: Warmer temperatures Steady, long-lasting precipitation

21. Warm Front Animation http://www.phschool.com/atschool/phsciexp/active_ar t/weather_fronts/

22. Warm Front and Cold Front Animation (Additional One) http://www.classzone.com/books/earth_science /terc/content/visualizations/es2002/es2002pag e01.cfm

23. Questions Decide whether each statement describes a cold front or a warm front. Write the word “cold” or “warm” on the line. 1.Moving cold air slides under warm air. 2.Moving warm air passes over cold air. 3.Heavy precipitation and cold temperatures. 4.Light, steady precipitation and warm temperatures.

24. Targets (Revisited) Targets: Students will discover how and why water changes state. Students will determine how air interacts with the atmosphere.

25. Homework SubjectHomeworkDue Date ScienceWeather Fronts wksht Quiz Monday