Lab: Plate Boundaries and Movement Answers

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7

How is the behavior of food coloring in the cool and heated water different? What caused the differences in their behavior?

Answer:

In the cool water, the food coloring stayed at the bottom of the container with very little movement. In the heated water, the food coloring rose to the top, spread to the sides, and then sank back down. This difference is caused by convection currents; the heat source makes the water at the bottom less dense, causing it to rise, while the cooler, denser water at the top sinks.

8

How did the convection model show how Earth’s mantle moves Earth’s plates?

A
The water carried the pieces of paper to the middle of the container.
B
The water carried the pieces of paper to the sides of the container.
C
The water pushed the pieces of paper to the top of the container.
D
The water pushed the pieces of paper to the bottom of the container.
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10

Which events most likely occurred at the boundary between the South American Plate and the Nazca Plate? Check all that apply.

A
destruction of crust
B
creation of rift valleys
C
formation of a trench
D
separation of two plates
E
subduction of one plate
11

Which feature formed in Area A? Which type of boundary is in Area A?

Answers:
Selection 1:rift valleys
Selection 2:divergent
12

What happens in the circled area?

A
creation of crust
B
process of subduction
C
formation of volcanoes
D
occurrence of earthquakes
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A
convergent
B
transform
C
lithosphere
14

Which statement best summarizes the information in the paragraph?

A
Earthquakes may occur at all types of plate boundaries.
B
The strength of an earthquake depends on the type of boundary.
C
All earthquakes at plate boundaries result from forces underneath Earth’s surface or volcanic eruptions.
D
Different types of plate interactions result in earthquakes of varying strengths at various depths.
16

Which of these ideas did you include in your answer? Check all that apply.

A
The food coloring in the cool water stayed at the bottom of the container.
B
The food coloring in the heated water moved to the top of the container then it moved to the sides of the container. It finally sank to the bottom.
C
Warm water is less dense and rises and cold water is more dense and sinks. These differences cause convection currents.
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