BW 6th gr Meteolology

Question Answer
What are the layers of the atmosphere – starting from the Earth going upwards? Troposphere, Stratosphere,Mesosphere,Thermosphere, Ionosphere,Exosphere
Which layers does the weather of the Earth occur in? Troposphere
Barometer Is an instrument that is used to measure changes in air pressure.
What is a Aneroid barometer? A smaller portable instrument without using liquid that measures changes in air pressue
What is a Mercury barometer? First barometer invented containing mercury – Consists of a glass tube open at the bottom end partially filled with mercury. – It contains no air. Greater air pressure pushes mercury higher a decrease in air pressure the mercury will fall
What is a Weather vane Shows the direction of wind – ususally on the top of a roof
What is a Rain gauge Instrument used to measure the amount of precipitation. consisting of an openeded can topped by a collecting funnel with a collecting tube and measuring scale
What is a Psychrometer Instrument used to measure relative humidity consisting of a wet bulb thermometer and dry bulb thermometer
Difference between weather and climate Is the condition of the atmosphere at a particular place and time.
What is Climate? Refers to the average – year after year – conditions of temperature, precipitation, winds, and clouds in an area.
What two gases do we have most of in our atmosphere? Nitrogen and Oxygen
What happens to air pressure as altitude increases and decreases? Air pressure decreases as altitude increases
Air pressure increases as altitude decreases
What causes winds? Are caused by differences in air pressure – which are the result of unequal heating of Earths surface
What are local winds Are winds that blow over short distances and are caused by unequal heating of Earths surface within a small area (water toward the beach)
What are global winds Is the movement of air between the equator and the poles
What is an Anemometer? Is an instrument used to measure wind speed. It has three or four cups mounted at the ends of spokes that spin on an axle.
What is relatiive humidity? Is the percentage of water vapor in the air compared to the amount of water vapor the air could hold. Can be measured with a psychrometer
How do clouds form When water vapor in the air becomes liquid water or solid ice (ice crystals).
What are the 3 main types of clouds? illustrate a small drawing of each Cumulus, stratus and cirrus
What is precipitation? Give examples Precipitation is any form of water that falls from the clouds and reaches Earths surface. Rain, Freezing rain, Sleet, Hail, snow
What are the major air masses that affect North America – Describe Maritime tropical, continental tropical, maritime polar, continental polar
Maritime Tropical are Warm humid air masses form over oceans near tropics – form over the Gulf of Mexico and Atlantic ocean and move first into south eastern US
Continental tropical is AIr masses from the southwest bring hot dry air to the southern great plains – form only in summer over dry areas Southwest and northern Mexico
Maritime polar is Cool humid air masses form over the icy cold North pacific and North Atlantic oceans.
Continental polar is Air masses form over central and northern Canada and Alaska.
What are the main types of fronts? When air masses collide they form – Cold front,warm fronts, stationary fronts and occluded fronts.
Cold fronts are Forms when fast moving cold air mass runs into a slow moving warm air mass.
Warm fronts are Forms when a warm air mass moves over cold slow moving air mass
Stationary fronts are When two air masses meet (cold and warm) and stall over an area.
Occluded fronts are Is when a warm air mass is caught between two cooler air masses.

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