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Only Sections 1-3 , 4 & 5 .

Air Mass

A large body of air that has consistent properties throughout , such as temperature and moisture content , at a given altitude .

Air Pressure

The pressure caused by the weight of a column of air in Earth's atmosphere .


A more portable type of barometer .


A weather system with a swirling center of high air pressure .


A layer of gases that surrounds the Earth .


A colorful display of light in the ionosphere , produced when charge particles form the sun are attracted to Earth's magnetic poles .


An instrument used to measure air pressure .

Cirrus Clouds

Thin , white , wispy clouds , often with a feathery or veil - like appearance .


A dense , visible mass of tiny water droplets or ice crystals that are suspended in the atmosphere .

Cold Front

A front that occurs when a cold air mass overtakes a warm air mass .

Cumulus Clouds

Puffy white clouds , usually with flat balloons , that look like piles of cotton balls .


A weather system with a center of low air pressure .

Dew Point

The temperature at which air becomes saturated with water vapor .


A day that marks the beginning of spring or autumn ; a day on which the length of daylight and darkness are approximately equal .


A cloud that is touching or is near to the ground .


A sharply defined boundary that forms when two alike air masses meet .


A large tropical cyclone with winds of at least 119 kilometer per hour (74 miles per hour) .


A region of charge particle , or ions , in Earth's atmosphere that overlaps the lower thermosphere .


A sudden naturally occurring electrical discharge in the atmosphere .

Occluded Front

A front that occurs when a warm air mass is caught between two cooler air masses .

Ozone Layer

A region of ozone concentration in the stratosphere .

Relative Humidity

The ratio of the amount of water vapor in the air to the maximum amount of water vapor that air can contain at that temperature .


The movement of one body around another .


The spinning of a planet or moon on its axis .


The day that marks the start of summer or winter , the day when the sun is directly overhead at latitude 23.5 degrees north or latitude 23.5 degrees south .

Stationary Front

A front that occurs when two air masses have formed a boundary , but neither is moving .

Stratus Clouds

Flat layers of clouds that are covered much all of the sky .


A small , But intense windstorm that takes the form of a rotating column of air that touches the ground .


The sound produced by rapidly expanding air along the path of the lightning discharge .


A small weather system that includes thunder and lightning .

Warm Front

A front that occurs when a warm air mass overtakes a cold air mass .


The condition of the atmosphere at a particular time .

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