Climate and Weather
 Lesson
4
Air Masses Move
In the fourth Climate and Weather
lesson, students tackle the tricky concept of the Coriolis
force. Many students have the misconception that water, when
draining from a sink or tub, spins in one direction in the
Northern Hemisphere and in the opposite direction in the Southern
Hemisphere. In this lesson, you will debunk that theory right
before your students’ eyes! But don't tell them that...
they’ll figure it out as you recreate a con artist’s
trick that actually fooled BBC producers.
Student Objectives
- Relating high-pressure air masses to fair weather; relating
low-pressure air masses to bad weather
- Defining front and giving examples of weather that can
occur at frontal boundaries where warm and cool air masses
meet
- Explaining how the Coriolis force modifies air movement
- Correlating wind to convection currents and the Coriolis
force
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