Weather Unit
7th grade science weather unit with mrs. george
Terms
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- air masses
- large body of air with the same temperature and humidity throughout; high pressure in center; low on edges
- stratus
- layers of smooth, even sheets, form at low altitudes
- front
- boundry between two air masses dependant on density and speed of masses
- counter clockwise
- in which direction do lows spin?
- false
- true or false: clouds are made of water vapor sticking to dust particles in the air
- temperature
- a measure of the average vibration of the molecules in a substance
- occluded front
- rarest front; cold front catches up and overtakes warm front lifting it off the ground
- global winds
- patterns of winds around the world caused by pressure differences
- solid to liquid
- melting point
- jet stream
- narrow high speed, high pressure bands of wind caused by temperature differences of polar and eqaulator masses
- volume
- how compact the molecules are in a substance; how much space something takes up
- wind vanes
- measures direction of the wind
- mountain breeze
- cool air from mountians going down to valley durring the night
- local winds
- daily or seasonal winds
- false
- true or false: the water supply on earth is always changing
- air pressure
- the force of the weight of air over a prescribed area
- clockwise
- in which direction do highs spin?
- uneven heating
- what causes differences in air pressure?
- land
- where is the area of high pressure during the land breeze?
- condensation
- when water vapor changes into liquid water
- stationary front
- fromt that does not move for some time; how long stationary depends on stability; ends up acting like a warm front
- cirrus
- fibrous or curly clouds, high thin, white and feathery
- precipitation
- water running back to Earth as rain, snow, sleet or hail
- true
- true or false: only water molecules evaporate, leaving behind pollution, salts, etc.
- high pressure
- high or low pressure:air RISES
- evaporation
- the process of liquid water changing into water vapor due to increased energy; molecule vibrate faster
- forecast
- prediction about future weather
- water cycle
- the process by which water is recycled
- groundwater
- the water below the earth's surface
- ocean
- where is the area of high pressure during the sea breeze?
- surface map
- station models of all the weather stations
- respiration
- the process by which animals release water vapor into the air when they breathe
- continetal (c)
- dry winds coming from land masses
- radiant energy
- includes energy traveling in rays; type of energy given off by the sun
- valley breeze
- cool air moving from valley to mountians during the day
- sea breeze
- cool breeze during the day coming from sea
- false
- true or false: air always moves from low to high pressure
- convection
- process by which heat is moved by a carrier due to density differences
- low pressure
- high or low pressure: high vibration
- conduction
- heat energy moves from one object to the next due to DIRECT CONTACT
- where they come from
- winds are named based on what?
- liquid to solid
- freezing point
- lows
- areas with lower air pressure than surrounding areas; valleys of air
- polar (p)
- clod air masses coming from the polar regions
- ocean
- where is the area of low pressure during the land breeze?
- high pressure
- high or low pressure: low vibration
- land breeze
- cool air from land during the night
- runoff
- the process of water on the surface of the earth flowing downslope to larger bodies
- highs
- areas of higher pressure than areas around it; peaks of air
- radiation
- heat moving in waves with no atoms or molecules present
- solid to gas
- sublimation
- anemometer
- measure speed of wind
- high pressure
- high or low pressure: low density
- maritime (m)
- moist winds coming from oceans or other bodies of water
- gas to solid
- deposition
- source region
- regions where air masses form
- false- wind direction
- forecasts are based on wind speed, air pressure, and cloud cover
- wind
- moving air caused by differences in air pressure
- 4 millibars
- there is a difference of __ _______ between each isobar
- cummulus
- masses of puffy, whit e clouds with flat bases
- low pressure
- high or low pressure: high density
- Bernoulli's Principle
- principle that states, as velocity increases pressure decreases
- liquid to gas
- boiling point or evaporation
- coriolis effect
- chang in direction of the wind caused by spin of earth
- station model
- group of symbols describing data collected at a particular station
- transpiration
- the process by which plants release water vapor into the air through their leaves
- tropical (t)
- warm air masses coming from the equator
- cold front
- when cold air replaces a warm air mass; takes shortish time
- warm fromt
- when warmer air moves over a cold air mass; takes a long time
- gas or vapor to liquid
- cooling point or condensation
- Beufort Scale
- chart showing speed of wind based on wind effects
- Pascal (Pa)
- unit for pressure
- true
- true or false: the higher the temp the farther the molecules space apart
- true
- true or false: the water is always balanced
- low pressure
- high or low pressure: air SINKS
- cold
- is it warm or cold during a mountian breeze?
- weather maps
- maps providing overall picture of weather activity across Earth collected from weather stations
- isotherm
- lines that connect places of equal temperature
- barometer
- instrament used to mesure air pressure
- isobars
- lines on a weather map connecting areas of equal air pressure