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

The North American continent is

1. a part of a larger tectonic plate that floats on the asthenosphere

2. a part of a larger tectonic plate that floats on top of the oceanic crust

3. a tectonic plate sinking beneath the Pacific plate

4. a tectonic plate that floats next to the Pacific plate

5. composed of at least two tectonic plates

Which features are likely to be found at a convergent boundary formed by two

oceanic plates?

A. An oceanic ridgeB. An oceanic trenchC. A series of transform faultsD. An island arc

1. Just A2. B and D 3. A and C4. Just D

Which of these features should be seen at a divergent boundary in the ocean?

This is a topographic map of the Philippines, a country known for

volcanic eruptions.

1. Only the Philippine Sea is moving relative to the islands; it’s moving right.

2. Only the South China and Celebes Seas are moving; they’re moving right.

3. The South China and Celebes Sea are moving left; the Philippine Sea is moving right.

4. The South China and Celebes Sea are moving right; the Philippine Sea is moving left.

5. All three seas are moving left.

Philippine Sea

SouthChina Sea

Celebes Sea

Describe the motions of the ocean plates relative

to the islands.

Which points in this diagram mark plate boundaries, and why?

1. All of them, because they are changes in elevation due to interactions between the plates

2. B and E, because they are drop-offs from the continental shelves

3. B because it is a trench, and C because it is a ridge4. C because it is a trench, and E because it is a mountain

range5. C because it is a mountain range, and A because it is a

continental shelf

A

B

C

D E

Broad scientific interest and increasing testing of the theory of plate tectonics

waiting until the 1950’s and 1960’s, because

A. Discussions regarding continental drift or plate tectonics were very limited –most scientists hadn’t heard about it.

B. Scientists were missing key data about the seafloor.C. There was limited interest in volcanic eruptions and

earthquakes before then.D. Ideas about mantle convection currents and seafloor

spreading began to get more attention.

1. A and B are true2. B and D are true3. A and C are true4. A, B, and C are true5. A, B, C, and D are true

What is a scientific theory?

A. Theories are educated guesses.B. Theories that are proven become laws.C. Theories have been tested many times.D. Theories never change.E. Theories relate to a narrow set of

phenomena.

1. A and B are true2. C and D are true3. Only C is true4. A, B, and E are true5. C, D, and E are true