Page 100 - Science Course 2 (Book 2)

Mo10-L3: Key Concept Organizer

Direction: Answer each question or respond to each statement in the space provided.

Question Answer
1. State the theory of plate
tectonics in your own words.

2. What is the lithosphere?

3. How are tectonic plates related to
the lithosphere?

4. Where is the asthenosphere
locatoed?

5. Compare the physical
characteristics of the lithosphere
and the asthenosphere.

6. How many major tectonic plates
exist?

Mo10-L3: Key Concept Check

Direction: Circle the term in parentheses that correctly completes each sentence.

1. Tectonic plates move at a rate of several (meters/centimeters) per year.

2. Scientists use a network of (satellites/ships) to track tectonic plate positions.

3. Density is the amount of (matter/pressure) per unit of volume.

4. When a f uid is heated, its molecules (contract/spread out).

5. Convection is the circulation within f uids caused by differences in density and
(thermal energy/mechanical energy).

6. During convection, warmer, less-dense f uid (sinks/rises) and cooler, denser f uid (sinks, rises).

7. Convection occurs in Earth’s (asthenosphere/lithosphere) where rocks are hot enough to
(be rigid/bend easily).

8. Convection causes tectonic plates to (move/stay stationary).

9. Plate movement can be caused by subduction, which occurs when one plate (pulls away from/sinks below)
another plate.

10. When two plates collide, one plate can sink into the (hotter/colder) mantle.

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