After studying the continental drift theory you have an idea of what Earth looked like200- 300...
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After studying the continental drift theory you have an idea of what Earth looked like200- 300 million years ago. Hypothesize about what Earth will look
After studying the continental drift theory you have an idea of
what Earth looked like200- 300 million years ago. Hypothesize about
what Earth will look like 100 million years from now. Draw a
picture in your spiral of your hypothesis.
Slide 2
Continental Drift- Animated Video
https://www.youtube.com/watch?v=uGcDed4 xVD4
https://www.youtube.com/watch?v=uGcDed4 xVD4
Slide 3
Sea Floor Ages Activity 1.What do you think the layout of
seafloor ages is? 2.Where do you think the youngest and oldest
seafloor is located? Why?
Slide 4
Seafloor Drilling
Slide 5
Resolution
Slide 6
Slide 7
Seafloor Ages Activity Choose seven different colors. Follow
the instructions on the Activity sheet to color the Seafloor Ages
Worksheet and answer the questions.
Slide 8
Todays Schedule 1.Finish coloring seafloor map (when finished
work on geology puzzle packet) 2.Discuss/label seafloor map
3.Answer seafloor questions on worksheet
Slide 9
Seafloor Ages Map Look at your map. Figure out what you are
looking at. Use a world map and label the oceans (Pacific,
Atlantic) Label each body of land (gray areas) with continent names
Look at the colors on the maps. What patterns do you notice?
Slide 10
Sea Floor Spreading Model Use the instructions to create a
model. Follow the directions EXACTLY. (pg 40 has pics) Answer the
lab questions on your worksheet (use Figures 19, 21 and 23 in your
book) When you are finished you may continue working on your
Geology Puzzle Packet
Slide 11
Seafloor Spreading Diagram
Slide 12
Slide 13
Slide 14
Slide 15
Slide 16
Read Pages 33-39 Pay Special Attention to: Diagrams Bolded
words Bolded statements Section headings Check your understanding:
can you answer the checkpoint and review questions?
Slide 17
Bill Nye Seafloor Spreading Video
https://www.youtube.com/watch?v=GyMLlLx bfa4
https://www.youtube.com/watch?v=GyMLlLx bfa4 Subduction zone-
pacific rim Video: https://www.youtube.com/watch?v=NbDqJy2
8hBw
Seafloor Spreading Model- 1 What feature of the ocean floor
does the center slit stand for? The center slit stands for the
central valley of the mid-ocean ridge. What prominent feature of
the ocean floor is missing from the model at this point? The
feature that is missing the mountainous ridge.
Slide 24
Seafloor Spreading Model-2 What do the side slits stand for?
The side slits stand for deep-ocean trenches. What does the space
under the pattern stand for? The space under the paper stands for
the part of the mantle called the asthenosphere.
Slide 25
Seafloor Spreading Model-3 How does the ocean floor as shown by
the part of a strip close to the center slit differ from the ocean
floor as shown by the part near a side slit? The ocean floor near
the center slit is younger, hotter and less dense than the ocean
floor farther away. As the floor moves away from the ridge, it
cools and becomes denser. The ocean floor near the side slits is
older, cooler and denser.
Slide 26
How does this difference affect the depth of the ocean? The
increased density causes the depth of the ocean to increase.
Slide 27
Seafloor Spreading Model-4 What do the stripes on the strips
stand for? The stripes stand for the magnetic stripes in the rock
of the ocean floor. Why is it important that your model have an
identical pattern of stripes on both sides of the center slit? The
pattern of magnetic stripes is the same on both sides of the
mid-ocean ridge.
Slide 28
Seafloor Spreading Model-5 Explain how differences in density
and temperature provide some of the force needed to cause sea-
floor spreading and subduction. Temperature differences in the
mantle cause convection currents. These currents cause molten rock
to erupt through the valley that runs along the center of the
mid-ocean ridge. As more material erupts, the sea floor spreads,
cools, and becomes denser. The denser material sinks back into the
mantle when it reaches a trench.
Slide 29
Seafloor Spreading Model-6 Use your own words to describe the
process of ocean-floor spreading. Answer should include: eruption
of molten material at the mid-ocean ridge the spreading of the sea
floor the subduction of oceanic crust at deep ocean trenches.
Slide 30
What parts of the process were not shown by your model. Parts
of the process not shown by the model include changes in density
and the melting of the curst as it sinks back into the mantle.