Date post: | 21-Jan-2016 |
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More Patterns: Ages of Rocks on Earth
How do we know how old rocks are?
• This isn’t our goal here.
• Most methods for dating rocks use radioactivity – the process of atoms falling apart at a predictable rate.
• To learn more, visit the Utah Geological Survey at http://geology.utah.gov/surveynotes/gladasked/gladage.htm
Can we compare age patterns on Earth with other planets?
• No.• To tell the age of a rock, it has to go to an
Earth lab• So we know ages from the Moon, and from
chunks of Mars that ended up as meteorites (about 120)
• But we don’t know many ages, and we don’t know where the meteorites came from on Mars.
Let’s look for patterns
• Find the handout called Age Patterns on the Earth
• Find your maps:– Age of Rocks on the Continents– Age of the Ocean Floor
http://bc.outcrop.org/images/tectonics/press4e/figure-02-14.jpg
What do the different colors on this map mean?
http://www.lithosphere.info/TC1-2006/TC1_Fig2-ages-062006.jpg
What do the different colors on this map mean?
Time to think about the patterns
• Talk to your partner about the questions in the graphic organizer. Fill in the chart.
Share what you figured out with another partner
• In a minute you will find your Venus partner.
• You will do a Structured Think Pair Share with that partner.
• Make this chart in your journal:
Think Pair
Share
Structured Think Pair Share
• First you will write what you think about the question in the Think box.
• Then you and your partner will each describe your ideas. Write your partner’s ideas in the Pair box.
• Finally you and your partner will decide on a common answer to the question. Write that in the Share box.
Question:
• How are the age patterns on the continents different from the age patterns on the ocean floors?
Time to share
• Let’s make a class share sheet about age patterns on the Earth.
One more Notice & Wonder
• Pull out your journal
• Make a N&W chart:
I noticed… I wonder…