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weather study guide
chap 16
40
Science
6th Grade
03/17/2012

Additional Science Flashcards

 


 

Cards

Term
Condensation
Definition
water vapor cools and
changes from a gas to a liquid
(in the atmosphere)
Term
Precipitation
Definition
occurs when water, in the form of
rain, snow, sleet, or hail, falls from the clouds to the ground
Term
Runoff
Definition
water, usually from precipitation, that
flows across the ground and collects in rivers, streams, and eventually back in the ocean
Term
Evaporation
Definition
occurs when liquid water changes into water vapor, which is a gas
Term
Absolute humidity
Definition
the amount of water vapor the air can actually hold
Term
Relative humidity
Definition
the amount of water that is really in the air (%)
Term
Condensation
Definition
is the change of state from a gas
to a liquid. Condensation occurs when
saturated air cools. (100% humidity)
Term
dew point
Definition
is the temperature where condensation can occur. At its dew point, air is saturated.
Term
dew point
Definition
Examples: glass of ice water and dew on the grass in the morning
Term
Cumulus
Definition
fluffy and often large (like cotton
balls). Can produce storms when they get large.
Term
Stratus
Definition
cover large areas (like a blanket) and
cause fog when they are near the ground.
Term
Cirrus
Definition
high feathery clouds, indicate change is
coming.
Term
Nimbo
Definition
prefix meaning rain
Term
Rain
Definition
form when water droplets in the clouds
become too large for the clouds to hold (usually 100 times its original size)
Term
Snow
Definition
forms when water vapor changes
directly to a solid (crystal) in the clouds--- due to below freezing temperatures
Term
Sleet
Definition
form when rain falls through a layer of freezing air, causing the rain to freeze on the way down.
Term
Hail
Definition
During a thunderstorm: when updrafts
carry rain up into the clouds before it can come down, it freezes and hail forms. The more updrafts, the larger the hail pieces. Eventually the hail falls to the Earth.
Term
What are the 4 types of precipitation?
How does each one form (pg. 488)?
Definition
Rain, snow, sleet, hail.
Term
What are the 4 types of weather
fronts?
Definition
Cold front, Warm front, Occluded front, Stationary front
Term
Cold front
Definition
forms when cold air moves under
warm air
Term
Warm front
Definition
forms where warm air moves over cold, denser air. In a warm front, the
warm air gradually replaces the cold air. Drizzly rain is usually followed by clear and warm weather.
Term
Occluded front
Definition
forms when a warm air mass
is caught between two colder air masses. The coldest air mass moves under and pushes the warmer air mass up. The coldest air mass then moves forward until it meets a cold air mass that is warmer and less dense. The colder of these two air masses moves under and pushes up the
warmer air mass. Cool temperatures occur and large amounts of rain or snow.
Term
Stationary front
Definition
forms when a cold air mass meets a warm air mass. In this case, both air masses do not have enough force to lift the warm air mass over the cold air mass. So, the air masses remain separate and often brings days of cloudy or rainy weather.
Term
cyclone
Definition
is an area of lower pressure than the
surrounding areas and has winds that spiral toward the center.
Term
anticyclone
Definition
is an area of high pressure where air moves apart, or diverges, and sinks.
Term
Which kind of severe weather is the most
dangerous and why
Definition
Hurricanes! With winds up to 120 mph!!!
Term
Thermometer
Definition
measures air temperature
Term
Barometer
Definition
measures atmospheric pressure
Term
Anemometer
Definition
measures wind speed
Term
Windsock
Definition
cone-shaped cloth bag open at both ends, shows wind direction
Term
Radar
Definition
used to find the location, movement,
and amount of precipitation.
Term
Satellite
Definition
they orbit the Earth and provide
images of weather system.
Term
Isobars
Definition
are lines that connect areas of equal
pressure. They form closed circles and
represent areas of high or low pressure.
Term
Weather maps
Definition
show us fronts, pressure areas
(low and high), and precipitation.
Term
What are the 4 components of the
water cycle (pg. 482)?
Definition
Condensation, Precipitation, Runoff, Evaporation
Term
How does temperature affect
humidity (pg. 483)?
Definition
When temperature increases: A.H. increases but R.H. decreases
When temperature decreases: A.H. decreases while R.H. increases
Term
What is the difference between
humidity (absolute) and relative
humidity?
Definition
Absolute humidity - the amount of water vapor the air can actually hold
Relative humidity – the amount of water that is really in the air (%)
Term
What kind of cloud would a thunderstorm for in (pg. 486-487)?
Definition
Thunderstorms would occur in cumulonimbus
clouds.
Term
How are clouds classified?
Definition
Clouds are classified based on form and
altitude.
Term
What are the three forms of clouds?
Definition
Cumulus, Stratus, Cirrus
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