Cracking Up:

1
Welcome! Cracking Up Plate Tectonics and the
Structure of the Earth
2
An Assessment Think Pair Share

• Best procedures read quietly to yourself (so
  you dont give any subconscious clues)
• As the instructor, we read it too, for timing,
  then ask if anyone needs more time
• If not, its time to vote simultaneouslyuse your
  fingers, right in front of your chest so others
  dont see (anonymous)

3
What is a scientific theory?

1. Theories are educated guesses.
2. Theories that are proven become laws.
3. Theories have been tested many times.
4. Theories never change.
5. Theories relate to a narrow set of phenomena.

1. A and B are true
2. C and D are true
3. Only C is true
4. A, B, and E are true
5. C, D, and E are true

4
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

5
Scientists use earthquakes to

1. Measure the age of the crust
2. Study the Earths internal structure
3. Measure the mass of the Earth
4. Support the theory of plate tectonics

1. A and B are true
2. B and D are true
3. A and C are true
4. A, B, and C are true
5. A, B, C, and D are true

6
Which features are likely to be found at a
convergent boundary formed by two oceanic plates?

1. An ocean ridge
2. An ocean trench
3. A continent
4. Volcanic islands

1. Just A
2. B and D
3. A and C
4. Just D