7th Grade Weather & Water

STUDY
PLAY
water cycle
the continuous movement of water between the atmosphere, the land, and the oceans; involves evaporation, transpiration, condensation, precipitation, infiltration, run-off
atmosphere
the mass of air surrounding the Earth
evaporation
the process by which water changes from liquid form to a gas
water vapor
invisible form of water; gas state
condensation
the process of changing from a gas to a liquid
clouds
a visible collection of liquid water droplets in the atmosphere
convection
the transfer of thermal energy in a fluid (liquid or gas) by the circulation warmer molecules rising and cooler molecules sinking
ocean currents
the steady flow of ocean water in a specific pattern
wind
air moving from an area of high pressure to an area of low pressure
weather
the meteorological conditions at a specific time and place: air pressure, wind, temperature, clouds, and moisture/precipitation
climate
the pattern of weather that occurs in an area over many years
frontal boundaries
the dividing line between two air masses with different characteristics
cold front
forms when cold air moves under warmer, less dense air and pushes the air mass up; may produce thunderstorms, tornadoes, heavy rain, or snow
warm front
a front where warm, less dense air mass moves up & over cold air; may start with clouds & steady precipitation followed by clear, warm conditions
stationary front
a front that occurs when neither the warm or cool air mass are strong enough to move past each other; may cause several days of the same weather
occluded front
a front where a warm air mass is caught between two colder air masses; brings cool temperatures and large amounts of rain and snow
air mass
a huge body of air that has similar temperature, humidity, and air pressure at any given height
jet stream
narrow belt of strong winds that blows near the top of the troposphere
transpiration
the emission of water vapor from the leaves of plants
cloud formation
water evaporates from oceans,lakes,and rivers,water vapor rises the temperature decreases and water vapor condenses around dirt/dust particles and form clouds under low pressure conditions
precipitation
the falling to earth of any form of water (rain or snow or hail or sleet or mist)
infiltration
the process in which water is absorbed by the soil and funneled down to groundwater
surface runoff
water flowing off the land into bodies of surface water
groundwater
water stored undergound
absorption
a process in which one substance permeates another
watershed
the land area that supplies water to a river system
elevation or altitude
height of land above sea level
air pressure
the measure of the force with which air molecules push on a surface; called barometric pressure in meteorology
acid rain
rain that contains more acid than normal
fog
droplets of liquid water suspended in the air very near the ground
dew
water that has condensed on a cool surface overnight from water vapor in the air
radiation
energy that is transferred in the form of rays or waves
conduction
the transfer of thermal energy by direct contact
energy
the ability to cause change or do work
pollution
undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities
trace gases
gases such as hydrogen and helium that exist in very small quantities in the atmoshpere
nitrogen
a gas that makes up about 80% of the Earth's atmosphere
oxygen
colorless, odorless, tasteless gas essential to respiration in animals; makes up about 20% of Earth's atmosphere
mean
Average of the population or sample.
median
the middle number in a set of numbers that are listed in order
mode
the number that occurs most often in a set of data
landform
a natural land shape or feature
latitude
distance north or south of the Equator
longitude
distance east of west of the Prime Meridian
YOU MIGHT ALSO LIKE...