Unit 1 Review Quiz

Two barometric pressure readings taken 12 hours apart in four North Carolina cities are shown in the table. Which city is most likely having severe weather?

• Asheville

• Charlotte

• Jacksonville

• Raleigh

Answer explanation

Charlotte is most likely experiencing severe weather as it shows a significant drop in barometric pressure compared to the other cities, indicating unstable atmospheric conditions.

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NGSS.MS-ESS2-5

Which statement about air pressure is true?

• Air density is always the same throughout the atmosphere.

• Air density increases with increasing altitude.

• Air density decreases with increasing altitude.

• Air density increases with temperature.

Answer explanation

Air density decreases with increasing altitude due to the lower amount of air above, resulting in less weight and pressure. This is why the correct statement is that air density decreases with increasing altitude.

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A meteorologist observes a decrease in barometric pressure and predicts a chance of light to moderate precipitation. Which frontal system is most likely approaching?

• occluded front

• cold front

• stationary front

• warm front

Answer explanation

A decrease in barometric pressure typically indicates an approaching cold front, which is associated with rising air and precipitation. Cold fronts often bring light to moderate rain as they move in.

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NGSS.MS-ESS2-5

Below is a simplified weather map of the continental United States. Which statement describes what is happening in the picture?

• As a cold front moves, the colder, less dense air moves below the warmer air, and this causes storms.

• As a cold front moves, the colder, less dense air moves above the warmer air, and this causes storms.

• As a cold front moves, the colder, more dense air moves above the warmer air, and this causes storms.

• As a cold front moves, the colder, more dense air moves below the warmer air, and this causes storms.

Answer explanation

As a cold front moves, the colder, more dense air pushes underneath the warmer air, causing the warm air to rise. This rising air can lead to storm formation, making the correct statement about cold fronts.

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NGSS.MS-ESS2-5

Which statement best describes the formation of a warm front?

• The temperature in a warm air mass increases.

• Cold air moves up over warmer air.

• A warm air mass meets another air mass of the same temperature.

• Warm air glides over colder air.

Answer explanation

A warm front forms when warm air glides over colder air, leading to gradual lifting of the warm air. This process contrasts with cold fronts, where cold air pushes under warm air. Thus, the correct statement is that warm air glides over colder air.

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NGSS.MS-ESS2-5

Why is a low-pressure system generally associated with cloudy and rainy weather?

• As cool air rises, it becomes colder, generating freezing rain.

• As cool air rises, it warms in the atmosphere, generating severe weather.

• As warm air rises, it cools in the atmosphere, creating condensation.

• As warm air rises, it gets warmer in the atmosphere, creating precipitation.

Answer explanation

A low-pressure system causes warm air to rise. As this air rises, it cools, leading to condensation of water vapor, which forms clouds and can result in precipitation, hence the association with cloudy and rainy weather.

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Which choice describes cool air masses?

• They rise when lifted up by more dense warm air masses.

• They mix easily with warm air masses.

• They are less dense and flow over warm air masses.

• They are more dense and flow under warm air masses.

Answer explanation

Cool air masses are more dense than warm air masses, causing them to flow underneath. This is why the correct choice is that they are more dense and flow under warm air masses.

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NGSS.MS-ESS2-5

Which choice best explains why a low-pressure system and a high-pressure system create different weather conditions?

• In a low-pressure system, air rises, creating storms. In a high-pressure system, air sinks, creating fair weather.

• In a low-pressure system, air sinks, creating fair weather. In a high-pressure system, air rises, creating storms.

• In a low-pressure system, air sinks, creating storms. In a high-pressure system, air rises, creating fair weather.

• In a low-pressure system, air rises, creating fair weather. In a high-pressure system, air sinks, creating storms.

Answer explanation

The correct choice explains that in a low-pressure system, air rises, leading to stormy weather, while in a high-pressure system, air sinks, resulting in clear and fair weather.

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Which statement best describes the general movement of air masses?

• They move from areas of high altitude to areas of low altitude.

• They move from areas of low temperature to areas of high temperature.

• They move from areas of high humidity to areas of low humidity.

• They move from areas of high pressure to areas of low pressure.

Answer explanation

Air masses move from areas of high pressure to low pressure due to the pressure gradient. This movement is fundamental in weather patterns, influencing wind and storm systems.

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NGSS.MS-ESS2-6

Of the following layers of the atmosphere, where is the density of air molecules most abundant (most dense)?

• Thermosphere

• Troposphere

• Exosphere

• Mesosphere

Answer explanation

The troposphere is the lowest layer of the atmosphere, where most of the air mass is concentrated, making it the most dense layer. In contrast, the thermosphere and exosphere have much lower air density.