Air Mass Movement - Middle School Earth and Space Science
Card 1 of 25
Which pressure center is associated with rising air: high pressure or low pressure?
Which pressure center is associated with rising air: high pressure or low pressure?
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Low pressure. Warm air rises in low-pressure systems, creating updrafts.
Low pressure. Warm air rises in low-pressure systems, creating updrafts.
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Which way does surface air flow around a low-pressure center in the Northern Hemisphere?
Which way does surface air flow around a low-pressure center in the Northern Hemisphere?
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Counterclockwise and inward (converging). Coriolis deflects rightward; air spirals into low centers.
Counterclockwise and inward (converging). Coriolis deflects rightward; air spirals into low centers.
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Which way does surface air flow around a high-pressure center in the Northern Hemisphere?
Which way does surface air flow around a high-pressure center in the Northern Hemisphere?
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Clockwise and outward (diverging). Coriolis deflects rightward; air spirals out from high centers.
Clockwise and outward (diverging). Coriolis deflects rightward; air spirals out from high centers.
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What does it indicate when isobars are far apart on a weather map?
What does it indicate when isobars are far apart on a weather map?
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A weak pressure gradient and lighter winds. Wide spacing indicates gradual pressure change.
A weak pressure gradient and lighter winds. Wide spacing indicates gradual pressure change.
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What does it indicate when isobars are close together on a weather map?
What does it indicate when isobars are close together on a weather map?
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A steep pressure gradient and stronger winds. Close spacing shows rapid pressure change over short distance.
A steep pressure gradient and stronger winds. Close spacing shows rapid pressure change over short distance.
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Which pressure pattern produces stronger winds: large or small pressure differences over the same distance?
Which pressure pattern produces stronger winds: large or small pressure differences over the same distance?
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Large pressure differences over the same distance. Greater pressure difference means stronger pressure-gradient force.
Large pressure differences over the same distance. Greater pressure difference means stronger pressure-gradient force.
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What is the general name for air moving from high pressure to low pressure?
What is the general name for air moving from high pressure to low pressure?
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Wind. Air movement from high to low pressure creates horizontal flow.
Wind. Air movement from high to low pressure creates horizontal flow.
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Identify the correct airflow: A) $1018\ \text{mb}\rightarrow 1006\ \text{mb}$ or B) $1006\ \text{mb}\rightarrow 1018\ \text{mb}$.
Identify the correct airflow: A) $1018\ \text{mb}\rightarrow 1006\ \text{mb}$ or B) $1006\ \text{mb}\rightarrow 1018\ \text{mb}$.
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A) $1018\ \text{mb}\rightarrow 1006\ \text{mb}$. Air flows from higher pressure to lower pressure regions.
A) $1018\ \text{mb}\rightarrow 1006\ \text{mb}$. Air flows from higher pressure to lower pressure regions.
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What is the direction of wind relative to a pressure gradient (high to low or low to high)?
What is the direction of wind relative to a pressure gradient (high to low or low to high)?
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From high pressure toward low pressure. Air naturally flows down the pressure gradient to equalize pressure.
From high pressure toward low pressure. Air naturally flows down the pressure gradient to equalize pressure.
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What is the name of the force that moves air from high pressure to low pressure?
What is the name of the force that moves air from high pressure to low pressure?
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Pressure-gradient force. This force results from differences in atmospheric pressure.
Pressure-gradient force. This force results from differences in atmospheric pressure.
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What is the most direct data-based claim if pressure drops from $1017$ to $1009\ \text{mb}$ moving east?
What is the most direct data-based claim if pressure drops from $1017$ to $1009\ \text{mb}$ moving east?
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Wind tends to blow eastward (toward the lower pressure). Pressure decreases eastward, so wind flows that direction.
Wind tends to blow eastward (toward the lower pressure). Pressure decreases eastward, so wind flows that direction.
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Which location likely has stronger winds: isobars $4\ \text{mb}$ apart every $50\ \text{km}$ or every $200\ \text{km}$?
Which location likely has stronger winds: isobars $4\ \text{mb}$ apart every $50\ \text{km}$ or every $200\ \text{km}$?
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Every $50\ \text{km}$ (closer isobars, stronger winds). Pressure drops $4\ \text{mb}$ per $50\ \text{km}$ vs per $200\ \text{km}$.
Every $50\ \text{km}$ (closer isobars, stronger winds). Pressure drops $4\ \text{mb}$ per $50\ \text{km}$ vs per $200\ \text{km}$.
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Identify the stronger pressure gradient: $\Delta P=12\ \text{mb}$ over $200\ \text{km}$ or $\Delta P=6\ \text{mb}$ over $200\ \text{km}$.
Identify the stronger pressure gradient: $\Delta P=12\ \text{mb}$ over $200\ \text{km}$ or $\Delta P=6\ \text{mb}$ over $200\ \text{km}$.
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$\Delta P=12\ \text{mb}$ over $200\ \text{km}$. Larger pressure change creates stronger gradient force.
$\Delta P=12\ \text{mb}$ over $200\ \text{km}$. Larger pressure change creates stronger gradient force.
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What causes surface winds to cross isobars instead of moving parallel to them?
What causes surface winds to cross isobars instead of moving parallel to them?
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Friction with Earth’s surface. Slows winds and reduces Coriolis effect near surface.
Friction with Earth’s surface. Slows winds and reduces Coriolis effect near surface.
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Choose the correct statement about surface winds: A) cross isobars toward low, B) follow isobars exactly.
Choose the correct statement about surface winds: A) cross isobars toward low, B) follow isobars exactly.
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A) Cross isobars toward low pressure. Surface friction causes winds to angle across isobars.
A) Cross isobars toward low pressure. Surface friction causes winds to angle across isobars.
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Which hemisphere has clockwise surface flow around low pressure: Northern or Southern?
Which hemisphere has clockwise surface flow around low pressure: Northern or Southern?
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Southern Hemisphere. Coriolis deflection reverses in SH, creating clockwise rotation.
Southern Hemisphere. Coriolis deflection reverses in SH, creating clockwise rotation.
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Which hemisphere has counterclockwise surface flow around low pressure: Northern or Southern?
Which hemisphere has counterclockwise surface flow around low pressure: Northern or Southern?
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Northern Hemisphere. Coriolis deflection creates counterclockwise rotation in NH lows.
Northern Hemisphere. Coriolis deflection creates counterclockwise rotation in NH lows.
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What is the typical surface-airflow pattern around a high-pressure center in the Northern Hemisphere?
What is the typical surface-airflow pattern around a high-pressure center in the Northern Hemisphere?
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Outward and clockwise (diverging anticyclonically). Coriolis deflects diverging air rightward in NH.
Outward and clockwise (diverging anticyclonically). Coriolis deflects diverging air rightward in NH.
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What is the typical surface-airflow pattern around a low-pressure center in the Northern Hemisphere?
What is the typical surface-airflow pattern around a low-pressure center in the Northern Hemisphere?
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Inward and counterclockwise (converging cyclonically). Coriolis effect deflects converging air rightward in NH.
Inward and counterclockwise (converging cyclonically). Coriolis effect deflects converging air rightward in NH.
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Which pressure center is associated with sinking air: high pressure or low pressure?
Which pressure center is associated with sinking air: high pressure or low pressure?
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High pressure. Dense, cool air sinks in high-pressure systems.
High pressure. Dense, cool air sinks in high-pressure systems.
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Identify the wind direction if point A is $1019\ \text{mb}$ and point B is $1011\ \text{mb}$ and they are nearby.
Identify the wind direction if point A is $1019\ \text{mb}$ and point B is $1011\ \text{mb}$ and they are nearby.
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Wind blows from A toward B. Air moves from higher pressure A to lower pressure B.
Wind blows from A toward B. Air moves from higher pressure A to lower pressure B.
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What does it mean when isobars are widely spaced on a weather map?
What does it mean when isobars are widely spaced on a weather map?
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Weak pressure gradient and lower wind speeds. Wide spacing shows gradual pressure change over distance.
Weak pressure gradient and lower wind speeds. Wide spacing shows gradual pressure change over distance.
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What does it mean when isobars are closely spaced on a weather map?
What does it mean when isobars are closely spaced on a weather map?
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Strong pressure gradient and higher wind speeds. Close isobars indicate rapid pressure change over short distance.
Strong pressure gradient and higher wind speeds. Close isobars indicate rapid pressure change over short distance.
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Which situation has stronger winds: $1016$ to $1008\ \text{mb}$ over $100\ \text{km}$ or over $400\ \text{km}$?
Which situation has stronger winds: $1016$ to $1008\ \text{mb}$ over $100\ \text{km}$ or over $400\ \text{km}$?
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Over $100\ \text{km}$ (stronger gradient, faster winds). Same pressure change over shorter distance creates steeper gradient.
Over $100\ \text{km}$ (stronger gradient, faster winds). Same pressure change over shorter distance creates steeper gradient.
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What does a larger pressure difference over the same distance indicate about wind speed?
What does a larger pressure difference over the same distance indicate about wind speed?
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Faster wind speed (stronger pressure gradient). Steeper pressure gradients create stronger forces and faster winds.
Faster wind speed (stronger pressure gradient). Steeper pressure gradients create stronger forces and faster winds.
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