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Welcome!
Cracking Up:
Plate Tectonics and the
Structure of the Earth
An Assessment: Think Pair Share
• Best procedures: read quietly to yourself
(so you don’t give any subconscious clues)
• As the instructor, we read it too, for timing,
then ask if anyone needs more time
• If not, it’s time to vote simultaneously—use
your fingers, right in front of your chest so
others don’t see (anonymous)
What is a scientific theory?
A.
B.
C.
D.
E.
Theories are educated guesses.
Theories that are proven become laws.
Theories have been tested many times.
Theories never change.
Theories relate to a narrow set of phenomena.
1.
2.
3.
4.
5.
A and B are true
C and D are true
Only C is true
A, B, and E are true
C, D, and E are true
The North American continent is
1. a part of a larger tectonic plate that floats on the
asthenosphere
2. floating on top of the oceanic crust
3. a tectonic plate separate from the Pacific and
Atlantic oceanic plates
4. very thick and sinking into the asthenosphere
5. stationary relative to the Pacific and Atlantic oceanic
plates
Scientists use earthquakes to
A.
B.
C.
D.
Measure the age of the crust
Study the Earth’s internal structure
Measure the mass of the Earth
Support the theory of plate tectonics
1.
2.
3.
4.
5.
A and B are true
B and D are true
A and C are true
A, B, and C are true
A, B, C, and D are true
Which features are likely to be found at a convergent
boundary formed by two oceanic plates?
A.
B.
C.
D.
An ocean ridge
An ocean trench
A continent
Volcanic islands
1.
2.
3.
4.
Just A
B and D
A and C
Just D