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