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9 terms

6th grade science Ch. 2 sections 2 and 3 air masses and fronts

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air mass
A large body of air where temperature and moisture content are constant throughout
front
The boundary between air masses of different densities and usually different temperatures
cyclone
An area in the atmosphere that has lower pressure than the surrounding areas and has winds that sprial toward the center
anticyclone
The rotation of air around a high-pressure center in the direction opposite to the Earth's rotation
thuderstorm
A usually brief heavy storm that consists of rain, strong winds, lighting and thunder
lightning
An electric discharge that takes place between two oppositely charged surfaces, such as between a cloud and the ground, between two clouds or between two parts of the same cloud
thunder
The sound caused by the rapid expansion of air along an electrical strike
tornado
destructive, rotating column of air that has very high wind speeds, is visible as a funnel shaped cloud, and touches the ground
hurricane
A severe storm that develops over tropical oceans and whose strong winds of more than 120 km/h spiral in toward the intensely low-pressure storm center

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