Download "Plate Tectonics" Extra Credit Assignment

Dynamic Earth
Interactive Activity
Explore through the website http://www.learner.org/interactives/dynamicearth to answer
the following questions --- this is linked for you on my web page!
1. How many miles thick is the mantle? ________________
Is the mantle considered to be made of liquid? (yes?/no?). (Explain)___________
_________________________________________________________________.
2. The inner core is made mostly of ____________ and is found __________ miles to
_____________miles below the surface and is about ____________ in diameter.
3. What is the Earth’s only liquid layer? ____________________________
4. Is the crust the thickest under the ocean or under the continents? __________________
5. In the plate tectonics module, which picture looks more like the earth today? (right or left)
6. Click on “How do we know this?”
- What did Pangaea split into 200 million years ago? ____________________________
7. The lithosphere is broken up into several large slabs called __________. They are
____________ moving. Approximately how fast do plates move per year? ________________
***Click on the Plate Boundaries Module:
8. How many major tectonic plates are there? _____________
9. Which type of crust is thinner (oceanic or continental)? Which of these is usually oldest?
____________________________
10. How does each plate get its name? ___________________________________________
11. What is the border between two tectonic plates called? ____________________________
Click on the “Slip, Slide, & Collide” Module: Read the first page then continue!!
12. Describe what happens at each type of convergent plate boundary:
oceanic-continental: _______________________________________________
Geological Activity: ______________________
continental-continental:_____________________________________________
Geological Activity:________________________
oceanic-oceanic: __________________________________________________
Geological Activity: _________________________
13. Match the words with the correct definition:
______Volcano
A. Rigid outer layer broken up by tectonic plates
______Asthenosphere
B. the area where one plate is being pulled under the
edge of another
______Continental crust
C. the tectonic plates float on top of this
______Trench
D. steep-sided depression in the sea floor
______Subduction Zone
E. chain of volcanoes
______Oceanic Crust
F. earth’s crust that makes up the continents
______Lithosphere
G. a vent in the earth’s surface in which magma and
gases erupt
______Volcanic arc
H. Earth’s crust found underneath the oceans
14. What is an island arc?
15. Why do two plates of continental crust collide instead of subduct?
16. Divergent boundaries in the middle of the ocean contribute to _________________. What
is a rift?
17. At a transform boundary why do earthquakes commonly occur? _____________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
18. What is the best-studied strike-slip fault and where is it located? _____________________
***Complete the Plate Interactions Challenge.
Finally, complete the last module: “Test Skills” Record your score________.
SHOW ME YOUR SCORE IF YOU FINISH IN CLASS. IF YOU FINISH AT HOME, PRINT
OUT THE FIRST SHEET SHOWING YOUR FINAL SCORE.