Air Pressure Convection Currents and Wind

Convection Current Review + Earth's Atmosphere and Weather Lesson

Ms. Mitchell- 8th Grade Science

1. Complete all slides.

2. Take notes in your journal when Prompted.

3. Place your Quizziz Score in TOP RIGHTHAND CORNER of your journal notes page.

8.10B - I can identify how global patterns of atmospheric movement influence local weather using weather maps that show high and low pressures and fronts;

Multiple Choice

What causes convection currents? Use your anchor chart to help you.

• Differences in Temperature

• Cold Temperatures

• Air Pressure

• Land Masses

Multiple Select

Select all that apply. Which of the following are areas where convection currents occur?

• Oceans

• Outer space

• Mantle

• Atmosphere

Multiple Choice

Typically, the _____ a substance is, the less dense it is.

• Cooler

• Warmer

Multiple Choice

Inside the Earth, the core heats up magma. The warmer, ____ dense magma rises, while the cooler____ dense magma moves downward. This creates convection currents.

• Less, More

• More, Less

Now you will begin the notes:
Earth's Atmosphere and the Weather.

​Write notes from each slide, but you can shorted them up.

The atmosphere is the gaseous layer that blankets the earth.

Air Pressure

• Air pressure refers to the weight of the air molecules pressing down on us.

• It depends on the temperature and how tightly pack the air molecules are.

• It is measured using a barometer in millibars.

High pressure is when air cools down and becomes more dense. Then sinks down toward Earth's surface spinning clockwise.

​

High Pressure

High pressure systems are often associated with
calm, fair weather.

​​High pressure

​High pressure weather: Sunny or clear skies, calm wind, and cool dry air.

Low pressure is when air warms and becomes less dense. Then sinks down toward Earth's surface spinning counterclockwise.

​

Low Pressure

Low pressure systems are often associated with more percipitation.

Low pressure weather: cloudy or stormy skies
Strong wind, warm moist air.

Multiple Choice

Air pressure depends on what two components?

• Weather and temperature

• Temperature and how tightly packed the air molecules are

• Weight and Temperature

Multiple Choice

Low pressure occurs when air _____ and becomes ______.

• cools, less dense

• cools, more dense

• warms, more dense

• warms, less dense

• A large body of air that has relatively uniform temperature and humidity.

  
  They can originate

• over land (Continental)

• over water (Maritime)

​

​Air Masses-

Cold Air Masses tend to approach from the N, NW, or W.

​​Cold Air Masses

Warm Air Masses tend to approach from the S, SE, or E.

Warm Air Masses

​Jet stream
Strong wind that generally blows from west to east across the globe.

• Jet streams are formed when a warm air mass meets a cool air mass in the atmosphere.

Multiple Choice

Air masses that originate over land are called_____ air masses.

• Mountain

• Maritime

• Peripheral

• Continental

Multiple Choice

Which of the following are formed when a warm air mass meets a cool air mass in the atmosphere?

• Warm air Mass

• Front

• Jet Stream

• Cold air Mass

Fronts

The boundary between two air masses.

Classified by which type of air mass (cold or warm) is replacing the other.

Map Symbols representing fronts point in the direction the front is moving.

When a cold air mass is replacing a warm air mass.

The air behind the front is colder and drier.

The air pressure increases (H)

Moist air is pushed up over the cold air.

Showers and Thunderstorms from along the leading edge of the front.

​

Cold Fronts

When a warm air mass is replacing a cool air mass.

The air behind the front is warm and moist.

The air pressure goes down (L)

Slow-moving, gradual rise of warm air over cold air

Widespread, continuous precipitation occurs along and ahead of the front.

​

Warm Fronts

Stationary Front

A boundary between 2 different air masses. Neither of which is strong enough to replace the other.


Stationary fronts come with light rain over several days.

Multiple Choice

The boundary between two air masses is called......

• Land Line

• Front

• Back

• Convection Current

Multiple Choice

Occurs when a cold air mass is replacing a warm air mass.

• Warm Front

• Cold Front

• Stationary Front

Multiple Choice

This type of front causes a decrease (L) in air pressure.

• Warm Front

• Cold Front

• Stationary Front

Multiple Choice

This front occurs when neither air mass is strong enough to replace the other.

• Warm Front

• Cold Front

• Stationary Front

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You are finished. Remember to write down your score and turn in your notebook.