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10 Cards in this Set

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What are the two main gases that make up earth's atmosphere?
Nitrogen - 80% and oxygen - 20%. Combined they make up roughly 97% of the atmosphere. T
What are the layers of the atmosphere in order?
Troposphere
Stratosphere
Mesosphere
Thermosphere
Exosphere
Where does most of the weather occur?
Troposphere
How is the troposphere warmed?
The sun
What is an isobar?
A line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period.
What is an isotherm?
A line on a map connecting points having the same temperature at a given time or on average over a given period.
Why are high-pressure regions usually associated with dry weather?
High pressure is an area of descending air. As the air descends it compresses and heat thus lowering the relative humidity
Why do low-pressure regions usually bring precipitation?
Low pressure is the opposite. It is an area of ascending air and as it ascends it expands and cools this rises the humidity. Thus why there is rain
What is the difference between an air mass and a front?
An air mass is a body of air. It has similar characteristics to the land on top of which it forms. If there is a low pressure, there is most likely to be a storm.

Fronts are the boundaries in between two different, or same air masses. (e.g: a cold front is when a cold air mass hits a warm air mass and quickly pushes the warm air mass upward.)
What are air mass?
An air mass is a body of air. It has similar characteristics to the land on top of which it forms. If there is a low pressure, there is most likely to be a storm.