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30 terms

Weather and water cycle

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Air Pressure
the force exerted by the weight of a column of air on a surface
Barometer
an instrument that measures air pressure
Troposphere
the lowest layer of Earth's atmosphere
Weather
the condition of the atmosphere in a particular place at a particular time
Wind
the mainly horizontal movement of air
Local Wind
a wind that blows over a short distance
Sea Breeze
when cooler air flows from water to land
Land Breeze
when cooler air flows from land to water
Global Winds
winds that blow over long distances from a specific direction
Coriolis Effect
the curving effect that Earth's rotation has on all free-moving objects, including global winds
Jet Stream
a belt of high-speed wind in the upper troposphere
Humidity
the amount of water vapor in the air
Relative Humidity
the ratio of the amount of water in the air to the maximum amount of water vapor that the air can hold at that temperature
Dew Point
the temperature at which air becomes saturated
Cloud
a dense, visible mass of tiny water droplets or ice crystals that are suspended in the atmosphere
Fog
a cloud that is near or touching the ground
Stratus Clouds
flat layers of clouds that cover much or all of the sky
Cumulus Clouds
puffy, white clouds with flat bottoms
Cirrus Clouds
thin, white, wispy clouds with a feathery appearance
rain
liquid precipitation
sleet
precipitation in the form of ice pellets/balls that are less than 5mm in diameter
hail
precipitation in the form of ice pellets/balls that are a minimum of 5mm in diameter
snow
solid, crystal precipitation
freezing rain
liquid precipitation that turns to ice AFTER it lands on a surface
nimbus
rain producing clouds
water cycle
the continuous process by which water moves from Earth's surface to the atmosphere and back
condensation
the process of changing from a water vapor (gas) to a liquid water
evaporation
the process by which water changes from liquid form to an atmospheric gas
precipitation
the falling to earth of any form of water (rain or snow or hail or sleet or mist)
transpiration
the evaporation of water vapor from the leaves of plants