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Chapter 6 Weather
Weather
38
Science
4th Grade
11/20/2012

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Cards

Term
How much of Earth's surface is covered by water?
Definition
3/4
Term
Where does the salt in the oceans and seas come from?
Definition
rocks and soil on land
Term
How does the salt get into the water if it comes from rocks and soil on land?
Definition
rivers carry it
Term
Why are some oceans and seas saltier than others?
Definition
As the water evaporates, salt is left behind. Warmer waters evaporate faster, so they tend to be saltier.
Term
evaporation
Definition
when liquid water changes to water vapor (water in the air)
Term
condensation
Definition
when water vapor cools and becomes liquid water
Term
precipitation
Definition
any form of water that falls to earth
(hail, sleet, snow, rain)
Term
atmosphere
Definition
blanket of air around the earth
Term
air pressure
Definition
pushing force of air
Term
land breeze
Definition
blows from land to sea
caused by air cooling at night
Term
sea breeze
Definition
blows from sea to land
caused by air heating during the day
Term
What kind of air rises?
Definition
warm air
Term
What kind of air sinks?
Definition
cold air
Term
How is wind named?
Definition
for the direction from which it comes
Term
air mass
Definition
huge body of air that all has nearly the same temperature and humidity
Term
humidity
Definition
the amount of water vapor in the air
Term
weather
Definition
a measure of temperature and precipitation at a given point in time
Term
front
Definition
an area where two air masses meet
Term
cold front
Definition
forms when a cold air mass bumps into a slow-moving warm air mass
Term
How do cold fronts affect weather?
Definition
they bring brief, heavy rain and strong wind; warm air is replaced by cooler air with clear skies
Term
warm front
Definition
forms when a warm air mass bumps into a slow-moving cold air mass
Term
How do warm fronts affect weather?
Definition
they bring long-lasting, lighter rain over a large area; cool air is replaced by warmer air with clear skies
Term
What causes clouds to form?
Definition
the sun warms water and it evaporates; as it rises, it cools and the water vapor condenses; droplets gather and form clouds
Term
cumulus
Definition
high, white, fluffy clouds that looks like cotton
Term
stratus
Definition
low, long, thin clouds that look like fake spider webs stretched out
Term
cirrus
Definition
high, feathery clouds that look like a horse's tail
Term
cumulonimbus
Definition
storm clouds that are dark and fluffy
Term
alto stratus
Definition
long, thin light gray clouds that bring long-lasting rain or snow
Term
meteorologist
Definition
scientist who studies weather
Term
thermometer
Definition
a tool that measures temperature
Term
barometer
Definition
a tool that measures air pressure (in millibars--mb)
Term
anemometer
Definition
a tool that measures wind speed
Term
wind vane
Definition
a tool that shows the direction from which the wind is blowing
Term
rain gauge
Definition
a tool that measures the amount of rain- or snowfall
Term
hygrometer
Definition
a tool that measures humidity
Term
How is a cold front shown on a weather map?
Definition
a series of blue triangles are drawn along one side of a solid blue line
Term
How is a warm front shown on a weather map?
Definition
a series of red semi-circles are drawn along one side of a solid red line
Term
How is a stationary front shown on a weather map?
Definition
a series of blue triangles and red semi-circles are drawn along alternating sides of a solid blue line
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