Seasons and Angle of Sunlight Feb 10 th
What two factors create our changing seasons?
What is our longest day of the year? Why?
What is our shortest day of the year? Why?
How would the answers to #2 and #3 compare if you lived in the Southern Hemisphere? (ex. Australia)
Does the angle of light striking an object affect the amount of energy being received by the object?
Gases in the Atmosphere
is the blanket of air and moisture that surrounds the earth
it extends to about 500km, after 500km the vacuum of space begins.
The atmosphere consists of:
78% Nitrogen Gas N
21% Oxygen Gas O
1 % Other Gases CO
closest to the surface (8-16km)
contains most of the moisture and is responsible for most of our weather
16-50km above sea level
has the highest amount of ozone gas. Ozone (O3) helps protect the earth from harmful UV rays
Memorizing the Layers:
Atmospheric pressure is the pressure that air exerts as gravity pulls it toward the centre of the earth
• altitude is the height above sea level, usually measured in m or km
as altitude increases atmospheric pressure decreases
on a weather map low pressure areas are represented with the letter “L”, high pressure areas “H”
Atmospheric pressure is measured in kilopascals (kPa) using a barometer .