Podcast 20.3Water
20.3 Objectives
• Describe the Water Cycle• Explain how Temperature and
Humidity are related• Identify various clouds by their
appearance and altitudes that they typically occur
• Use pressure gradients to explain how winds are created and explain how Earth’s rotation affects their direction
Vocabulary• Condensation• Precipitation• Humidity• Dew Point
Evaporation• Transpiration• Relative Humidity
Evapotranspiration
• Transport• Surface Water• Infiltration• Runoff• Groundwater
The Water Cycle
Web Water Cycles
• There are many good water cycle websites – and a few with really silly songs…
• http://earthguide.ucsd.edu/earthguide/diagrams/watercycle/index.html
• http://www.ac-nancy-metz.fr/enseign/anglais/Henry/eau.htm#wc
Another View
Facts about water
• Of all the water on earth 97% of it is in oceans
• 3% is freshwater • ½ of all freshwater is in
Canada• 60% of all freshwater
used is for irrigation• Many of the worlds’
population does not have access to freshwater
Drinking Water
Many believe the next world war
could be over water
Temperature and Humidity
At any temperature the air can only hold a specific amount of water – no more
Similar graph in Temperatures we know
When air cools at night
• What happens to the water it can no longer hold?
Dew Point
• The temperature at which water starts coming out of the air and forms liquid
• It gives you a clue as to how saturated the air is
• Will you get fog or frost tonight?
Indoors -Moisture causes
problems
Clouds
• Clouds and fog form when the temperature drops below the dew point
• They come in many forms
Lower Level Clouds
Stratus• Think fog, mist• Large, stretched
out
Cumulus• Puffy low
clouds
Mid Level Clouds
Altostratus• They look the
same but higher
Altocumulus• They won’t be as
thick as regular cumulus
High Level Clouds
Cirrus• Wispy high level
clouds
Cirrostratus• High sheets of clouds
great sunsets
RainmakersNimbostratus• 3 day rainstorms
(welcome to Seattle)• Days of yucky
weather
Cumulonimbus• Thunderstorm
clouds• Grow in height –
planes must avoid
Punch hole clouds
Weirdos Mammatus Clouds
•
Kelvin Helmholtz Clouds
Lenticular
Contrails
• What are the products of combustion?
End Podcast 20.2
• Make sure you get your notes checked to receive credit. Then take them home and review them for next time