seasons catalyst what is the redshift, and how does it provide evidence for the big bang? what is...
TRANSCRIPT
Seasons
Catalyst What is the redshift, and how does it
provide evidence for the Big Bang? What is the difference between the
heliocentric and geocentric model? Venus is one planet closer to the Sun than
the Earth. What can we conclude about the length of Venus’ year, compared to the Earth’s?
Write in complete sentences!
Don’t talk during the Catalyst!
Objectives
By the end of today, all SWBAT…State that the Earth’s axis is tiltedDescribe the difference in intensity between direct and indirect sunlight
Explain how the tilt of the Earth’s axis produces seasons
Agenda
Stand up and pair up Notes:
Earth’s basics Tilt Direct and indirect light Seasons
Classwork: Images and Critical Questions Bingo Homework????
Review: Earth’s Basics
Earth and Sun
Key Point #1: The Earth revolves AND rotates counterclockwise around the Sun
As we already know, the heliocentric model states that the Earth revolves around the Sun
Earth is divided into Hemispheres
Latitude
Latitude = Imaginary horizontal lines that run East-West around the globe
Take a look at the earth’s orbit again.
What do you notice?http://www.classzone.com/books/earth_science/terc/content/visualizations/es0408/es0408page01.cfm?chapter_no=04
Tilt of the Earth Key Point #2:
The tilt of the Earth causes different parts of the Earth receive sunlight of different intensity
The Earth is tilted 23.5º degrees
Flashlight Demo
Look at the flashlight beam when it is shined directly over the paper and look at the beam when it is shined at an angle.
Which beam is more intense?
Direct and Indirect Light
Direct light: light that hits the earth “straight on”
--Concentrated, strong
Indirect light: light that hits the earth at an angle
--Spread out, weaker
You try: NORTHERN Hemisphere…
Direct or indirect?
Hot or Cold?
You try: SOUTHERN Hemisphere…
Direct or indirect?
Hot or Cold?
Key Point #3: The tilt of the Earth’s axis causes there to be seasonsHemisphere TOWARD Sun = SUMMER
Hemisphere AWAY from Sun = WINTER
Season N: ________________
Season S: ________________˘
Season N: ________________
Season S: ________________˘
Season N: ________________
Season S: ________________˘
Season N: ________________
Season S: ________________˘
What season in the Northern Hemisphere???
Summer
Think about this…
Why is the North Pole always experiencing winter?
The North Pole is always cold because it always receives indirect rays that are less intense.
The North Pole is always cold because it always receives indirect rays that are less intense.
Stations…
Work on the Classwork with your group mates
Team points for those working together!
What is wrong????
A.
B.
C.
D.
Summer Summer
Winter Winter
Bingo Vocab
DirectIndirect0 latitude90 latitudeSummer
WinterConcentrated
TowardAway
Bingo
This place always receives direct sunlight
Bingo Vocab
When the Northern Hemisphere is tilted away from the sun, the season is…
Bingo
When the earth is tilted _________ the sun, the season in that hemisphere is winter.
Bingo
This angle of sunlight is less concentrated
Bingo
This angle of sunlight is concentrated
Bingo
This place always receives INDIRECT sunlight
Bingo
When the earth is tilted _________ the sun, the season in that hemisphere is summer.
Bingo Vocab
When the Northern Hemisphere is tilted toward the sun, the season is…
Homework
2.4 Homework
Exit Questions
1. How does the tilt of the Earth cause seasons? (Hint: use the words “intensity” and “sunlight”)
2. Where on Earth is it always the same season?
3. Look at the picture to the right. What season is it in the Northern Hemisphere? Explain in a complete sentence.