WARM-UP 10/27 1.What is the half-life of Carbon? 2. The element chaparralium has a half- life of 24,000 years. If a fossil contains 25% of the original amount of chaparralium, how old is
Transcript
Slide 1
Slide 2
1.What is the half-life of Carbon? 2. The element chaparralium
has a half-life of 24,000 years. If a fossil contains 25% of the
original amount of chaparralium, how old is this fossil? Show your
work!
Slide 3
-Formation -Based on density -Inner Core -Innermost -Thickness
-Temperature -Materials -State -Outer Core -Thickness -Temperature
-Materials -State * Strong magnetic current Layers of the
Earth
1. Which layer of the Earth do you think is most important and
why? 2. If a fossil has.195% of the original amount of an element,
how many half lives have passed? 3. Which type of dating would you
use to find the age of an ancient basket made of natural fibers?
Why? End
Slide 6
Write 3 observations and 1 inference!
Slide 7
Identify and label the different continents on your map. North
America South America Africa Europe Asia/India Australia
Antarctica
Slide 8
Take 2 minutes to observe the world map. Make 3 observations
about the continents coast lines. Make 1 inference based on your
observation End
Slide 9
Take 3 minutes and work with your partner to try and fit the
continent puzzle pieces together. End
Slide 10
Do they fit together perfectly? What may have caused the
coastlines to change over time? Come up with 2 possible reasons (2
minutes) End
Slide 11
Look at the small pictures on your puzzle pieces. Those are
fossils found in those areas of each continent. Take 2 minutes to
observe the fossil placement. Make 3 observations Make 1 inference
End
Slide 12
Rearrange your puzzle so that all of the fossil segments line
up. (2 minutes) End
Slide 13
Take 3 minutes to draw in dots along the plate boundaries to
show recent earthquakes. (large dots = more activity, small dots =
less activity) End
Slide 14
Take 2 minutes to draw in triangles to show volcanic activity.
End
Slide 15
Take 2 minutes to observe the marks you just made on your map.
Make 3 observations Make 1 inference End
Slide 16
Alfred Wegner Concept with no mechanism
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1. The continents fit together. 2. Fossils of the same animals
are found along the coasts of different continents.
Slide 18
Supercontinent 300 million years ago Cycle
Slide 19
Scientific theory (concept + mechanism) Lithosphere is broken
up into tectonic plates Moved by convection of asthenosphere Past
plates and current plates How do we know? How many? Farallon
Plate
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3. Seismic, volcanic, and geothermal activity along plate
boundaries.
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4. Sea Floor Spreading Mid-ocean ridges Tectonic plates moving
separating New magma rises Form new oceanic crust Older crust
pushed away
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5. Magnetic Reversals Molten rock Magnetic minerals Align with
magnetic field Magnetic field reverses 177 times in 85 million
years Last 600,000 years ago Recorded in rock Similar pattern to
age of rocks
Slide 24
Convection Asthenosphere Heated rock Expands and rises Cools
More dense
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1. Spreading New material pushed up at ridges Pushes older
material away 2. Subduction Denser plate sinks Pulls rest of plate
2 main types of movement
Slide 26
Today you learned about all of the evidence supporting plate
tectonics. Using that information make a prediction about what
Earths continents will look like in 100 million years. Make sure to
support your claim with at least three pieces of evidence and
provide commentary for each.
Slide 27
Which piece of evidence for continental drift do you think is
most compelling and why? Compelling: strong and forceful, having
influence